Malicious PDF — malware analysis report

Static analysis result for SHA-256 37162be0712205e2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 21:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9972af55bd65828463020a0b91af6c25 SHA-1: d4a4e85d36b31b1336a2a0b2a2de92bbbe45b2d5 SHA-256: 37162be0712205e2eb554050ca1c435c1cdb22d036883eb12d815cafc084149d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The presence of these links suggests the document is intended to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://franceplus.fr/userfiles/file/59652267507.pdf
    • http://sprinter-lab.ru/content/File/sowupolik.pdf
    • http://gesundheit-im-blog.de/userfiles/file/rogonevifipad.pdf
    • https://aawyx.com/sites/default/imageuser/file/15395543128.pdf
    • http://goozzl.com/userfiles/files/45285283007.pdf
    • https://yukkumpulgroup1.com/contents/files/81670045299.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210913_164929_4242.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/96125550678.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a71bc8b6f8fff5ce0db99af1eb255765/metupinorepemof.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/29139556526.pdf
    • http://okgwa.net/50/files1/file/66062328130.pdf
    • http://www.findvoters.com/userfiles/file/sufudoxojimodeveno.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bd035aaf8149a4528bf5d021a164afaf/6095809402.pdf
    • http://poetische-malerei.de/web/editor/files/7372931224.pdf
    • http://iweldbot.com/ckfinder/pho/files/13668489049.pdf
    • http://machinegroup.ru/img/outer/files/29850094973.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eac90df5---wedadunexenebujofinipava.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ec600d666f5ae7f17fe4d7091ad13cb/10415045108.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/86fdef616e809be4745866cde4902d08/21317172565.pdf
    • https://szekszardportal.hu/userfiles/file/zabosekivukuro.pdf
    • https://suacuachuyennghiep.com/uploads/files/81271471801.pdf
    • https://elmawadah.com/userfiles/file/velej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fortnite+minimum+system+requirements+android
    • 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_off0000c55e.bin
8bc351ca41659d8d50d56b7f5df32ff3e4e5fbe2bcdfbc19bce7b5c7c2953c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 17388 bytes
font_01_sfnt_off0000f240.bin
08ed09f08ee5006407f6716425b211abc2ece747c28210083b47e6b09f8bc150
pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 10700 bytes
font_02_sfnt_off00010aa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes