Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d4a14900db054…

MALICIOUS

PDF

94.2 KB Created: 2021-07-24 07:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a516ff1d04b46a59706b3f6a2f1193a SHA-1: 2df22378606bbd6d46986b0f989a3c215ac825e5 SHA-256: cb5d4a14900db054d537c3fd4eaf50fb4a9348daf2f1f215ce4cdec5762ec774
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The 'SE_MFA_LURE' heuristic suggests the document is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://aggengr.com/uploads/CMS/file/makonipemarakum.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/17822198437.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zunelisikijudekinevututaz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9e232f8f6---99869822511.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/98357701852.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922517e906---71141180446.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/91d5d7bdccbac691637e02acb2443cc8/86423621441.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zuwediwazenetopez.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce00996c6---venajanewa.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/66745544564.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9f3dd1a78fb9601562ed8c341740f665/82744993256.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/vilesab.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/20c98f2cb8ff18c0850003fa9253a1af/tuxaminexuponoru.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/93535710954.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/71b8cee26dd20f1f331b73cfa72d68f3/ravuvoxupiza.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cda56a4b8---59980864268.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/tovimomabogobibedawikem.pdfIn PDF document text
    • http://altinay-law.com/images/file/joluzufotapolupapuz.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/52800775442.pdfIn PDF document text
    • https://sealskinz.ru/files/file/66009459000.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tudiwiwaronokaxovek.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eecd39a---93839847200.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8d583dad---49886111718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+transfer+whatsapp+chats+from+android+to+iphone+for+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 17164 bytes
SHA-256: 43aaf79b938901a82eeffdbc485db3d297e3cf31c6647ccb8d75367c94a5265f
font_01_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_03_sfnt_off00014f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4B 11172 bytes
SHA-256: 052796a6201d3f883e68a1ba7ad91b9db170d5b99c7dbbb56642695c7d69686f

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