Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ac12ceb21ff3d2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 21:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbdf033c35dc1b26309c579f24ef69dc SHA-1: b5c6cfc8cbb8298dd3601d49a8d7096e5569efbe SHA-256: a6ac12ceb21ff3d20b46db0d78b729e4dacc00c376aa3b4ebe7449856150bbe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=pixel+gun+3d+hacks+2020 PDF link annotation
    • https://hilanguage-com-tw.triangle-design.com/files/ritomurowokeso.pdfIn PDF document text
    • http://anninh247.info/upload/files/15276031223.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/56053702200.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/98919052169.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/nagofalukufisamife.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/gitemifakigiwapopav.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901014537.pdfIn PDF document text
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/67357940072.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/lebiralun.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630942353274792041.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/12364727408.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/38660063388.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea7e3431---7576500472.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb592cf1c---kasug.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/62474554587.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131095c2c846---jurefaxezukobulevosatimi.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/67060558712.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307d900a95b---53926126944.pdfIn PDF document text
    • https://vitanov.rs/files/11871575698.pdfIn PDF document text
    • https://asiapharma.la/files/files/ponetidugetowidu.pdfIn PDF document text
    • http://protok.pro/upload/files/dagogininitoruwolumixil.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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 11040 bytes
SHA-256: c0c01fc2bfecc5d9e595443a4a3e38ea36a866703a268e67b396bc2d1fd61f9d
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 18376 bytes
SHA-256: e334f25c16d55f7a736d6d4a774abbe611075a03cb9ab7facf759d1c9908131f
font_02_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1