Malicious PDF — malware analysis report

Static analysis result for SHA-256 8085fe34936a3c6c…

MALICIOUS

PDF

79.1 KB Created: 2021-08-13 03:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 011aa68185b7b59e8a2e904b848171fa SHA-1: 94742887f4d33cbad7518a0e0aa4710b283e099a SHA-256: 8085fe34936a3c6cd841ce00f0e32775fb9e00b4b18bcf4a061b24d21566b9bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://crysiq.ru/uplcv?utm_term=biology+1st+semester+final+study+guide+answers PDF link annotation
    • http://bawaconstructions.com/editorData/file/lagesanoxuluzuviwagafalom.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd1f870e3---34377715915.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/pijujavanikigalawewam.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2ffdacd3cca09ffabf3a4b71a44e78e8/74455585233.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/fominiwegusujikof.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/86347919951.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607280811b35a---soligaw.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zimatax.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a91897ce795---niboledaloxafafozuxisojab.pdfPDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9665b30cc1---zipitowiv.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/92365636314.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429ccb42db---29703716143.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r2oudsddngkt6rk86h9v4dl6jk/1889393361.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/80658660263.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d3b19e55---27825522475.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081dab181fe7---64152124198.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1d4dfc5332e6d2e931573813c2d33685/kikejuwevabanajimo.pdfIn PDF document text
    • http://dalaichau.com/files/897485178.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/23668232305.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caf41faf6f9---79780602245.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a24eb497f---joturaranorijukurewagoluj.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/df6c7360597feebe3306ac73cdb2f234/94500951591.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7e4bbe5ba77939c6eb5a66c7e512f888/89499932742.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a66935b---xofulizakuwetogokijelufar.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/kunuzajulanora.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/35057265349.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/linapebipifokobozeberot.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 11104 bytes
SHA-256: 89dc5ba8862b9175973acb1501bfc1ebb317bb0c63af6c3344cb6ffe9484ec64
font_01_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 16420 bytes
SHA-256: 02097cd717bf670fd7cb046362ac4cef79d39fd95437e7aa4a3d4cf4ace70a55
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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