Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4a83b0e14ebda4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 17:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bf2798ad07285e8e930014e5240a0df SHA-1: 922602155afbc9912b6605cbf58ccfac559003f9 SHA-256: 2b4a83b0e14ebda490c8325f49d2a28862f76b906dd52495327d44ddcac48a2c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of external URI links and link farm characteristics strongly suggests an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=octahedral+shear+stress+theory+pdf PDF link annotation
    • https://smsenerji.com/resimler/files/warireru.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f86ecf96a3293756c5f08674aeefc226/wivedigunidagi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087460f1e3fb---gepimunafujexikuri.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/fekirodisosago.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ved0r0mfpgkuvfkcar1mlpo1r0/fetiwafamuxuxisaxivisemoz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89f9650b0---70992626505.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/61132530486.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9897db24---kerizumukivimomopam.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/domizopufusagubaleri.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3a976e1376fee94db08d1ffde71d511f/63810253635.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33ccbe129---23825932770.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1815dac25cc43a18139933c5e002c8c/gaped.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/61225981497.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0cbd6a51b---28652182818.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/fb0547023db14ba29a088e2f0b6fa972/91621069039.pdfIn PDF document text
    • http://bjallstar.com/upload/file/28251945248.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/telazadagusidutonozaxetuv.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/ridemumizu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d9490c04---75595613238.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0550068ac---xorixorefofipak.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/41302156555.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/zetavokujawade.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/16606770096.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/94417238680.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/reboraxixixiwuzaxugi.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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 10660 bytes
SHA-256: b77c941348bb6e4e056233b6558e3df883c240fe05d37e8b0621fd9f4a37d454
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 20336 bytes
SHA-256: d1255aaeff52677145f0fb1b58507c8e0e12166cdf7981ac975724dd1d062e34
font_02_sfnt_off00013975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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