Malicious PDF — malware analysis report

Static analysis result for SHA-256 287b859836c0e44f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 15:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 154c64961db7fa9d407a78b70a9133b0 SHA-1: ca4ce6a6be1deef13a6737202029da73d52258cb SHA-256: 287b859836c0e44fde16b1d9002ed8c9c1963802c51cfaae593cee1263ffe850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm structures suggest a phishing or credential harvesting attempt, directing users to potentially malicious content hosted on compromised WordPress sites. The document body was unreadable, but the presence of external URIs and link farms indicates a likely redirection to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=mht+cet+2020+syllabus+pcm+pdf PDF link annotation
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f0d57a5e14e8cd0e7f037c9f1196de6f/77645389942.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/wuminivimijexuxitirefero.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/22825303348.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/diwisamarirofipanorelomu.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/35922669926.pdfIn PDF document text
    • https://areicon.com/images/file/xavowazimozozudodagoxen.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/16148741165.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/f1v7oe33a7ofcmfaev8qe6hiud/44005947243.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bekudowelipopukumuko.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/rexopomewegukelarerude.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/ropuwit.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ieqdon2lks6v5qhptjv5va58kk/fulofo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/98a8a18beb890818d681c03a8ace4571/ratusikovifom.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/96089185723.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gigepur.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9228d5b6e---37286085507.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ah4079icfedheejkbn4d2kqq5l/soxixafij.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e94dbbd9047d378b82f0ae9737ee7719/sarusexopimarozisosakam.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/wujuralonenelu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bed8f4b1---dimasoladopukefupafig.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2266b39951---66208878931.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e95g8ef5s6ququrgvho62jru9k/46123680731.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7s862j6v97ee7rk2psff8fb4is/36476331083.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d8167848cd4c1fbc0ce1c9df316102fb/dejijajosepusiwuxikadak.pdfIn PDF document text
    • 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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 18196 bytes
SHA-256: 66b6afcfda07b55da0e2232bdc3c3aaadc0daa8a429889392621a1052612d1be
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 11056 bytes
SHA-256: 145990e408bbcef40aa7db0edda014a454efd9664a8ac83304393984f075d88b
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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