Malicious PDF — malware analysis report

Static analysis result for SHA-256 86abde3fe3a30f88…

MALICIOUS

PDF

77.9 KB Created: 2021-08-24 06:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04b6b3504f4b3aac75b1c1645901d6ef SHA-1: 5112776917a34ae3a4dbce9ad0dfb1b3a21e394c SHA-256: 86abde3fe3a30f889b5b55b5d27de29988d557c3e45fa02fa847f4a209929e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=the+rate+of+photosynthesis+is+controlled+by PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/664de60e168d1d82550e9153a2cf9869/76373141912.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h021k4qtigg8trdq2e5nd01ua1/kewowe.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/14992599578.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/upo9no4ud4uuckvq789p9dkl6p/gagafunafaf.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dc6b0bcdn90sn2vnn8e5j5rqgi/pugafimopisoxinagoxam.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/lasanuxunarujoxizunelejoj.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/48712939998.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/91104856216.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/90279547189.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b06d796ee---88803270090.pdfIn PDF document text
    • http://guowangcable.com/d/files/fofuwefunelagetokajur.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec63bc3d8---63688003080.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847b1060e8---goxokefirikerujemowix.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/45733865115.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/op4269hg5agep34brh2ofk03f2/mugimamowezovanuw.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2611afdc3034eda7a46660c84dd26f3b/nagetewinotedavimadiw.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/16414676719.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608142f807595---wipirujawilivokazopiregu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/67175604370.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/kimimal.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c628daea3a7---velazezivomox.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/32943483670.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0e634ab09c82d31b85a7ff227ca7c135/kogajinepiladetenarasine.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608760d2535a6---97589817056.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/gekil.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_off0000d09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09D 15212 bytes
SHA-256: 8423db566963477f69f1c683e067f0ab212b6de180fe01d2a0842bf0c36e2b2f
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10932 bytes
SHA-256: da7c0233d07aea9e44237116b728b2a9c5fc9c7b0e81bc67f85b1dcfc5142b92
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1