Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97b932c80e21086…

MALICIOUS

PDF

81.7 KB Created: 2021-10-07 12:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2269beae659e4a9f692c8f402f95f317 SHA-1: 059fc5868718afa811b5333a0121497b6d62fd13 SHA-256: d97b932c80e21086913207f0412be3f40000a409ce43a6826dab805312485e7b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on disposable or potentially malicious domains. The presence of external URIs and links to WordPress upload directories suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=baby+tongue+attached+to+bottom+of+mouth PDF link annotation
    • http://architettotoma.it/userfiles/files/16355194734.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/jolakabemejinenigote.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/46019579221.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/39741atmhsip92m03jkasmltsr/lajufokubebugopeba.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/xubiduzisetiloriv.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2d404b476---60796066382.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/sabupater.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/92938275919.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/64428536328.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b6049ae902cb6efc752450f5d0aa6127/53966383753.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-09/images/files/3869779669.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/funakilewuf.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/sabozejiwemarewikararibo.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/86113450946.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/88399273208.pdfIn PDF document text
    • http://abpaluso.com/upload/file/81378591875.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nesavabovesofil.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/60853198977.pdfIn PDF document text
    • http://mancuathuphuong.com/media/ftp/file/miwudadiwixed.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b44edbb5b3789841304b3f3eb5ec4c9b/vaguvoju.pdfIn PDF document text
    • http://methese.com/upload/files/72298790233.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/70664305432.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xosumivuroxixoliv.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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10924 bytes
SHA-256: 8be7ebaa8c3fd13661e923667c2d63d7fa4ca077550b5c479775abb802921b82
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 18628 bytes
SHA-256: 4e8ab9d344c72ce48ac012778094b61ea38652f1352448e11351971a158fc22b
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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