Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6f4fc9f2275794…

MALICIOUS

PDF

88.2 KB Created: 2021-07-17 08:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b410de0bd217738ee631dc3c18f690a SHA-1: 17e40455dc0fac1d9fc81710eb393fe519c3f848 SHA-256: 8c6f4fc9f227579476a069a0639c8550c387ced0bd2c6f2953412b7e6147ff05
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tecnicadovolante.com/images/file/xitubovefolirizuzegof.pdf In PDF document text
    • http://siembra.me/uploads/files/40319518979.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccd60f640---11707658916.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/69533745255.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cca71dc8b---zawasuzikozovorez.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zigivo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18429043918.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d193a7598b---vovemowumugukewoku.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/daxevefizurirenulira.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/35905951587.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/99811957376.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa3825784---lodududadevurenitiju.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/nabutidejotatifobemit.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/wabulogepajuxifuraminofe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ae58a521---guperonolar.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e84fe35960392d82ef14785e5ab5b117/17339484079.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e575d1938da---30131968497.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49429575125.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/26vb98tc3937crh8v8q1r79i3r/bexonirar.pdfIn PDF document text
    • https://edarky.net/data/file/19244198916.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c6l2tlk9lr41lfto2j18ehg1bf/48242438149.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/detiwawojamupadawurarag.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/wabolav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=harry+turtledove+the+great+warPDF link annotation
    • 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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 16776 bytes
SHA-256: 23e96021a3ee4586300444f70a71de81921b30f8e49c14b55f32db49e35232cb
font_01_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 10520 bytes
SHA-256: e8838497022062e5266bfd6f316b3b631ac90a3af4403bc2f4679523a5466393