Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4862b8375ded70…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 720a669e6e9d616795ebd9cbb06fa887 SHA-1: 304104a0db9941a8ef4c54ea3c4c4c04a54edb8b SHA-256: eb4862b8375ded7071dc5acd2f2336576215b123925508a417a9be03d9919d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://smidgel.ru/uplcv?utm_term=active+to+passive+and+vice+versa PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c15799018f---29151934344.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/18362804233.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/6347257903.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cb9256e1---jufikupizulujusas.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/nuwelusositerifus.pdfIn PDF document text
    • http://rayer.cn/d/files/viwevomogerosozokap.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bdc6d7566cb4728a6ea511aaf59c5f79/36334583082.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/43962732179.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/40009048274.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/jigubisa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d555af62506445b31bf319f01cc69e30/xixufi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0a6c2f08---durelavuna.pdfIn PDF document text
    • http://snft.ro/media/file/tokukirokepitatugi.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zubijatevomon.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210902232149.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/50836035246.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/menemuruwakunedanaxasofo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/selojizusivab.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/15460921635.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/resopoxopifebiw.pdfIn PDF document text
    • https://agros.net/uploads/file/3691273909.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/kesuxiriforawowutubokiguk.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 17292 bytes
SHA-256: 1df76d15ddbecc4c382b63dc45fcd5449f5b1ad83ba137688f69a402e1dc10e4
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10508 bytes
SHA-256: 79b1e78d9278895b9835ede793cd1bbd6c6a987fe90ef2fdef97fb76bbcb23c1