Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc87f584b67e0a23…

MALICIOUS

PDF

74.0 KB Created: 2021-06-27 11:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a6264c7eef045849d9484d11fcff5f87 SHA-1: 2c9c7c8d4810585f5a8f61f90f38814c10e4f3f4 SHA-256: cc87f584b67e0a23b0cddc674b94afc4355da2126b843269bc246950260d2610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded URLs indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/30f522d878604b51048f0e1769b5ae5f/2612430406.pdf In PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f7d30f9bb9eea99456983a77278ff0b9/78114218321.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/092v06a5391o8g44rju4ve9bd5/tadogekapamefijeg.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/54832765186.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9064e856---binozis.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7a72fc25ff6a853dc42d25a736c6dab3/kawal.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jc6egf8p0it7rl5me2cgvaqfqf/liweninosuwi.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/lisoxinuxabomikunez.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cba92e630---98607023086.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b3fa9b6482eb89a217551ea2065a7592/xavikejavakalalupusonik.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656179418---duverezufomanekinobo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/xusukapuz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/88079379074.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/84552328749.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2fb5ba3b---75342739627.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/66ac65a4b65a1f2c532927cf2385ebac/22183657656.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e271dae66190012551c8b8f36d2ac9e7/lifizedanes.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8u1b3ttq6aonjlqluj3qifsd4/10985957528.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/40164547539.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f654edcc4---koxagagimufufiramer.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/860c9c24929e70dd00b66f0d13042df5/jikoruzi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f43c7e8e---pijudisoju.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebe8eb99a---88050783844.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wovokipukida.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/68e4b7179b130af993d5591acf4823f0/83047689564.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/tamizaluvazokifolamapobut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=crackle+chocolate+cookiesPDF 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_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 15144 bytes
SHA-256: e9ac5d7406426c8b142788c07767f6bec5e10d338a0694afa6373c4e72d9e0c5
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10348 bytes
SHA-256: 188aa60d78c6e730b819f4eb5cbfaf42d60adf4cf278b2ec61ce837abdb4ba6d