Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef80562f8fa5bf82…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 02:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b36e817a4ed63fe840904f86eab455b SHA-1: b7b6147811b8461be426a25e91acdc24c38de9da SHA-256: ef80562f8fa5bf82f91390e75c43d8038784d9810819664754762ebd250acfb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://srinivasagroup.com/ci/userfiles/files/renudafuwagiror.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc584c608---87125363315.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d551d83a51---xamizisu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/9947782337.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210924180103.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/75260464290.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/52243069741.pdfIn PDF document text
    • https://linker.tw/files/lufevinobexenut.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/42759991784.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/47303050650.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/62166695765.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145af4a4869b---76982480939.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fc6f476---52555299524.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/kepefozotupeduwugumixi.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bezusoxefo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a661765f683fe3e8d86604d6d66d648a/rasuv.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/19263390356.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/93415405871.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/19630901698.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/e78d9b1792a5d17d744e8a6827af8f14.pdfIn PDF document text
    • http://steinemann-ag.ru/95677930578.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/22659061959.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zawibitakinotufopebig.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/79102811809.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/80178823875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cute+emoji+copy+pastePDF 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_off0000b742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB742 17876 bytes
SHA-256: e16d0f23cc720153078d843bfbb2b13bf36d1379b9241cac633d38f5761bc4b2
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 10660 bytes
SHA-256: 757f30845c35db17ee9de441b8207668b81c908d47b33438271daef3f9b9d83b
font_02_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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