Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f50cfeb876a66df…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 16:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d2493924ff1fdf64765ea1984ec0094a SHA-1: 5337202cc0e3f406b21e8a58961669c5f81f0221 SHA-256: 9f50cfeb876a66dfa86dc1accf262b7bbadaa636b2145cfd844118e498897ec7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4227b843af---nivefelubutugus.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6f5777a993874c07bc975da79de8901d/93526825141.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210602165229.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/69711348334.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b650b832782---9114653974.pdfIn PDF document text
    • http://tochalco.com/uploads/files/rugiwekukenewobunomajog.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a288d36b5ba---lekebuma.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5671564d6e---jakikotokawolimujepabat.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/91er6ehbtdaf2hlmadpfh6d9gm/vavolivatawawevegazunuv.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89902722724.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa786528e3---56146871786.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/912f61cef93dc383fb3d8fdfcb1c0d92/90553275371.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/67509295810.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b914eea0e---8600559701.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4118292a22---94140470167.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160772768ea19f---60688426082.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/66241783294.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/55shhq7d1ogb47ml7sgedcb105/45125915664.pdfIn PDF document text
    • https://puppometalli.eu/file/wisixad.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/18174e4d2bc65745a56050f789c03b43/fetovori.pdfIn PDF document text
    • http://iphysiology.ru/upload/74702549734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+a+cubone+in+pokemon+goPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 19240 bytes
SHA-256: b483f5c50b4b2bc9ff66171a992dab036c3b6326b49e79849a7ee8ea693aac41
font_01_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 2684 bytes
SHA-256: d05b08629525517774b896350f69ffacbeb88e1d5bcbe0ca3db4528e3e34094f
font_03_sfnt_off000148da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DA 10812 bytes
SHA-256: b5567d1e67ebea6927b8abce6945621786517de885c04e57b83fffa1ba808d3b

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