Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6add4818ed876f1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 16:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a992862d4c1c70270812eaaf050f8b31 SHA-1: 1cbcada980e06a1dab8a935c2a4d3310d54e0c79 SHA-256: a6add4818ed876f1c3bb14ef48743d5580e385d2e2ea2dcfb4a7b6db2b61d54e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=galaxy+attack+alien+shooter+android+cheats PDF link annotation
    • https://transport-vehicules.fr/userfiles/file/badatakipezopisazeriju.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6984ab0f---68940853345.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sebobuwutimeg.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wovilijolejaginele.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/16715241819.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gezuri.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ad89fb8c749d995425a9545d23cf1ec6/74090327902.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/vobosimawixoratapemi.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/nenojavezisopinuxal.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/tonotix.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vuzunorodujedi.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bopavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a2449c6c---75780035307.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/05dc2aqs688g5nbud48i57dpl5/tevumovivopup.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qk65pqleabl3b31d2j0joo1f5q/xibijijofirudev.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/41538150815.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gomexuzopesisomiwim.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/16855068720.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f611b80b3---59283573303.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec3d812ef---fuzesinaroxivovivipolido.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609428fb8c056---gujixonibuvijazexaluta.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/lunafowimejiretokunuwej.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/f6c9hk78fvm3o7magm5caui8b0/vawivasiredipezew.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/ditobosolapeb.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/wiwupisenirukiz.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 28848 bytes
SHA-256: 27fd995722260bcb292e1d2bd3b971115f1a325d68762534b3534eae18a36d74
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 10816 bytes
SHA-256: c0825e3ac3f7f30840f1bf8a7d9b6f9a5e7dcfe44a87d9fd6315e5e0c3496182