Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5a2100c2ed7c8…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 03:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9674b54b111006eb0df77508dad2e84e SHA-1: e5ce7a670eadf21045675993b29b66d50e02ec22 SHA-256: 20d5a2100c2ed7c8a769a6f91337ef132be671424e6cf4c37c4c4baa62a9b36c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459a618ee1c---77761528392.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/sexubevasexodulekupofafe.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/batirusojoxexa.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/42451604386.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/86956794923.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631836723.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/185705787.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/50381566235.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/98263227543.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/43130225452.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133878f211f7---8654985316.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/3667647482.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8kvllempe8ir4mjsd16cu0s3b2/65010644909.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/jaxisewitipimapetizorega.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/95840087853.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb6bbde24---94166660464.pdfIn PDF document text
    • http://progetec.org/userfiles/files/94242772117.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/6526032932.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/25262833659.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/9443260501.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/64936484126.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zalivowiroto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=8+ball+pool+full+mod+apkPDF 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_off0000b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 15008 bytes
SHA-256: b79b42ce0eeefcfe058c3d1a802a94e963efc7a809c34d4792ff3c019e96b6b5
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 10408 bytes
SHA-256: ba1828f955901cdb8630a2ff35c7514fcd8627a401a1d0c0606041dbb4881817
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1