Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a85b7b102fd860…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13f4bf5162c2a78ece42d7d0dd144019 SHA-1: 9269c07306615b8b05ad01062bff6431be87e8dc SHA-256: f0a85b7b102fd860b825f1e3af5e3db4c2f93e86a737ce40e3b9a9d4fd5b336d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and a raw IP address, suggesting it's used to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://alltechsro.cz/files/bepupojadizereporujije.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/34861643823.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/worinoligozaboside.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8708becc3e57e753a8dfd883c13bfff9/70038139550.pdfIn PDF document text
    • http://rivucota.com/upload/files/gisulapunagosapigiwegisaj.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a23f09cf---xulotunexejitoguxowen.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/gu782289bg2mscsrvjq3a1vrk2/refel.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff256e4db---93535362109.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ca9ngu8ckiir31jqab42etjaai/43751809133.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7d869da3fef9354c170fbeefd05ffe78/nosuwakebofiroxaviwokur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7513e516d4---16575988585.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe2ce1bb4---rukemog.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/xuvitimufemivapetana.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f6a343ad23a23ebaac418b152526ee38/43304745301.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/75150868087.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kiredakeb.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab65b7dcac---61875631820.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f1e3dea0---lijojapesarosiw.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d561614f6fe395ce05081841656d8b2/ziginabul.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/gefafuruxasedafafakat.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/ranevefeve.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4613d912eb8fbee8c6be2d24e2dafae9/gikisugitizexujivoxu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075b935dc489---depijuvixixoxagowas.pdfPDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021063006084073499.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086881dd1cb4---gosanijuzuvaka.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4b35812f162fde7c9240727f8afb704f/18017682715.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/wuzokizafukexufos.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103ae81c985---76557422280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=synonyms+and+antonyms+worksheet+first+gradePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 17796 bytes
SHA-256: 6f296ee69e7e462e2ca9dca4cb2c9f41e7bbf330312f0be0006cae98da9aa9d4
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 11120 bytes
SHA-256: d014c602fc51ad4b595483c7b6ea9d502de7b1720b3bac72999a8b7e163a3425
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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