Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9612eb3522d991d…

MALICIOUS

PDF

112.9 KB Created: 2021-09-03 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6db25aa2ea18d5d9704ab8232b430a2 SHA-1: 91802aa7427ef18a0c8335f4fb8fe9d1ea4c7880 SHA-256: b9612eb3522d991d74578592dd0b0cf1d790cd8887270eebb70c31fe8f9f0e15
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=dare+to+believe+smith+wigglesworth+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105445400b21---vebafarivalekizamowanu.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/gazugeken.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/72nhd0ocd60k8bqe9nqrrdo1ds/ditato.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7605e2881f55be0d453af4c0ad485c73/manitujogodirafixex.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5116548079.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vi236kcjje7iifb2qqrqm0f730/tejorapopiwifar.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/kikesuwomesotexexano.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/45256693604.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a5719358addeb97ca294f6a00b83fcaf/jolesejasow.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/64712410155.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/1307803671.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/71158086422.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/18566499646.pdfPDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510d3a18c7.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/zeseso.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f8f32e20c---werut.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/klncub0q0uh0hhfnsugujnekfq/76740339078.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98dfb00b1---73043449906.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zilorowilozagipatemurago.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f566f1b56cd---99164537943.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cd2fee473457f2289790cfa5b9b97101/47499185950.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fa956a5264c4cc0d09c10b95df578cc0/95386185185.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i5t5ln3c02eftijgc4r8ps80h7/14294243677.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/48602017810.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9c6d6ad4---nugalufivosegodupi.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/18314574090.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_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 17472 bytes
SHA-256: 0fcdaa6b351d2d077bba008c8ced8b8b899bda17859f3b0a1dd0d48a331984ec
font_01_sfnt_off000183e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E6 11136 bytes
SHA-256: 1ec7f69d2fd45db24ab1c3bb5f52024fb46bdf5d993bed209be7c53eeb778899
font_02_sfnt_off00019d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1