Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b5db6e6f683e64…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 07:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3046d76e1da65e238916bf14e6cde4b SHA-1: 9e82f01c1ab2bf71e3141b2d735a66786450d486 SHA-256: c7b5db6e6f683e64bbd0ffdc49ed626d31b663a06d7a28a752987ffba6a3160f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.gieskestukadoors.nl/ckfinder/files/files/82703753272.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigebubawazidatetutos.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/88bd3980f5519e43a6f9c2d0365a9ad4/64761098074.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/85426863995.pdf
    • https://777mto.org/contents/files/31663352382.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5e2b7ba06---26108299543.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/88345558533.pdf
    • http://rlmlaw.com/images/edit_images/file/75514271331.pdf
    • http://sun-tes.ru/files/file/5615665113.pdf
    • http://ajarnveerapong.com/UserFiles/file/fokazorerinewuwiwu.pdf
    • http://commandhousecreations.com/uploads/files/80860167765.pdf
    • http://karpatskiles.ru/store/files/75253716490.pdf
    • https://guanlai.tw/uploads/files/202109191927189048.pdf
    • http://vuason.vn/upload/files/57905834357.pdf
    • http://sirindhorn.net/upload/File/fuvosipe.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613816ab304d3---donigododitoxobunapebez.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/mosupuravoliri.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/59493443422.pdf
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/85752327298.pdf
    • http://inruho.ru/ckfinder/userfiles/files/bajuwatamagonut.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210916_021848.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/panuweboneze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+1+com+bow+master
    • 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_off0000ad7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16792 bytes
font_01_sfnt_off0000c591.bin
c52781683465aa2e738e700676fc644fbe9fd3bc2f06ab5ae05b7fcfa222bcd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 10744 bytes
font_02_sfnt_off0000de64.bin
ae618387d045ea3dca8b5d303b71e6921503a9475aa3a5490798f1ca527bb885
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16260 bytes