Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df751a5ae118028…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a5663d4474b373d0a4a04f8815206c2 SHA-1: e93b6e1245dc6f8c9832c819c570cd57248c774d SHA-256: 1df751a5ae118028c65505d54f791e056d667f64f7534eae8cd4572f7b4543c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=solved+examples+of+normal+distribution+pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1n7lh69omug742hpk11jsh0qga/30702422512.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/mugufuvomefalun.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7084ee05---mitekatobojuvig.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/841f00b0196de817069c27fbcaed1381/mabizora.pdf
    • http://bigband-ulm.de/userfiles/files/22080106285.pdf
    • http://smflow.in/admin/uploads/file/61065061968.pdf
    • http://madonnina.info/userfiles/files/lozapafixisilixex.pdf
    • https://santechnikosdarbai.lt/images/files/getez.pdf
    • http://e-district.org/userfiles/file/dogexaxawinu.pdf
    • https://wittnebel.dk/file/favodamitumaf.pdf
    • https://hideab.se/tc/Mediagalleri/file/pateroba.pdf
    • http://lawyergz.net/uploadfile/files/57613987611.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/87069153470.pdf
    • http://sjar-tech.com/uploadfile/file///2021051516045591.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e265320155a426293c1e2d2c2f988ed5/36249106757.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945689941ea---woferibewijolonagobuvakas.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/flj9l63j86huvd7emejlt27ed1/30066962581.pdf
    • http://rhodeislandalpha.com/clients/56223/File/poleladav.pdf
    • http://cbgnfinance.com/userfiles/file/baposinozo.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/ratisuzuzekulag.pdf
    • http://bocghedanang.com/media/ftp/file/97022266810.pdf
    • http://sakem.org/userfiles/files/kivot.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c3b2f6a9---31635064491.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 16792 bytes
font_01_sfnt_off0000e2c2.bin
463453bc27d0bbd3ae2ffd98ed1222d0e7270362727e7915c53031134c888c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 18968 bytes
font_02_sfnt_off00011443.bin
1efdd71643a3e8506415886070e99c5b7c4333025fecb2e2681468713d07c6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 11144 bytes

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