Malicious PDF — malware analysis report

Static analysis result for SHA-256 234b01b682318381…

MALICIOUS

PDF

85.9 KB Created: 2021-08-13 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2687a0705a2dd47874fcaf353e0d8d28 SHA-1: 47efe88694f58b1d5d260a166e4e71b2537cbc85 SHA-256: 234b01b682318381d8bdcc9ff8255d8adec58f0edd8a2f3e60007439a9a8d09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=dell+inspiron+15+5000+drivers+for+windows+7+32+bit
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3af1c98f5---fepomajuzagi.pdf
    • http://thegioituigiay.net/uploads/files/fosilijugiworotiputop.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb4hrvba02kthsbg7vo1fv3ohe/70807317751.pdf
    • http://mousike.it/img_ins/files/29008669419.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kg57qjqdrouu3ds2id4du4jho9/83506903359.pdf
    • http://aite-materials.com/upfiles/file/komadutebegole.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9be88a6ad3f4df7ca3deb402bd17f9ed/9174795488.pdf
    • http://schodylux.pl/userfiles/file/bidasu.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed86e0fbe7---74931527749.pdf
    • https://la-klamm.org/Files/files/diwawozef.pdf
    • http://geonatlife.es//ckfinder/userfiles/files/62860393487.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c011d8ed9---nujovoduto.pdf
    • https://aviseco.ro/userfiles/file/99588170555.pdf
    • https://luminex.pl/upload/file/37284283992.pdf
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdf
    • https://sgcaregiver.org/contents/files/73139503233.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03ce3715a---kokarumisazomesuzo.pdf
    • https://cowichanmusicfestival.com/userfiles/file/37227803476.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160764b6894f82---73939546980.pdf
    • http://novussiteyonetimi.com/uploads/file/jomalumetorowofi.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22eec662acc1795b2fdf84ac27ab02d3/99903074390.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58aa48189---31552754279.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 16792 bytes
font_01_sfnt_off0000fec6.bin
1f974df1e77248e94fe83fa24a02f5b6570dd7e142662225ff1c5fb020e4dc6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 18584 bytes
font_02_sfnt_off00012f63.bin
c4ba31879367142692b6a73720980b452dca49df584f9acc8d807578410d6c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 11272 bytes