Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb979d40175e46e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a27aff4c9bac064b56f969490c062d83 SHA-1: abc9fa3606124118b7795e7b9d79e434cbc6bb80 SHA-256: acb979d40175e46eae69046e38f42694e6ca57141cd8a5ab610d9523e2b72e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://securitydm.net/slicice/file/13227103192.pdf In PDF document text
    • http://61kidsclub.com/userfiles/file/78119150844.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615155e8dcf2b---mupafagivigowigori.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210925115207.pdfIn PDF document text
    • http://edallyshop.com/upload/files/36849961571.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/rutejosepanipozuposunagap.pdfIn PDF document text
    • https://onlinendttraining.net/files/21490909085.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/xexurugakotogos.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/tikugalarowasumugosu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/nasexelo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091014172845.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/28961175001.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/62460854522.pdfIn PDF document text
    • http://bresky.cz/res/file/64709888571.pdfIn PDF document text
    • http://entrackintl.com/uploads/87554222159.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/bulad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/354863469aa94a0c5525d507a677bb8e/xaxabutenakutetirivoxazu.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/lifumabosugowovavixuvipo.pdfIn PDF document text
    • http://hotelexpert.ro/uploads/files/wawomejafimizapadoluzisul.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/93697972903.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/34980280693.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/60m9hd44hithteo6d8tfl3sfe5/90789314491.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dijuvikidavu.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///zajojubibepujedan.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d7cffcae1aa77368b5ca8852c491c04a/bemokafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+pc+androidPDF link annotation
    • 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_off0000b40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40D 16568 bytes
SHA-256: e74ecebb7b55d3c79c1bdc0795a7b40afd875409f00b3e1fa5295439097e1419
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 10392 bytes
SHA-256: cd0afabbfcd057ea8e9495828774126305a0e102d5faa43f38e1b893b54cb44f
font_02_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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