Malicious PDF — malware analysis report

Static analysis result for SHA-256 33747a541517a85d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 05:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4db51976833dd6be392b0c39f8556826 SHA-1: d0ec3e7c11d6ec156587ef3b40c8c06d5045fdbf SHA-256: 33747a541517a85d1ead5850f27e0c0f2e94991c8d1345f8599f1a8a1dba92fd
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS upload storage, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, likely contains lures related to data transfer or other common phishing themes, further supported by the MFA lure heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ios+to+android+data+transfer PDF link annotation
    • http://www.hgekc.com/media/userfiles/file/rokefatuwomatarinupi.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kobagedowolixej.pdfIn PDF document text
    • https://network-italia.it/file/sodamitumukeweja.pdfIn PDF document text
    • https://siroyensao.com/upload/files/gofebebova.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65702073613.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/ronewadijezimuvalaxufimet.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/47815165370.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/bumijaporixalebijalosemi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904210145509.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/79760452754.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/89376988417.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/6527804872.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tesonubewugat.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ee257400c2d2e8099b2184e1f5d8c468/89870373011.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0d90871d19cfc11b105bd7314ebae9d/xujozanaxes.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/foxivovegap.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/51183911490.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf4d76d32---48161807241.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/60384159767.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/bijipesowopizitefos.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/52916160195.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/munulekojepukikezemogad.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/90237137195.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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10252 bytes
SHA-256: 9cd105b86ed4cf3ee064f4864434d1db683e2cc3e8399594ea9d7a34f32d49fc
font_02_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 18816 bytes
SHA-256: 2909a9a6c03bf54e60d2a305544daffa43489113e37a6a98f04c39e1837db4d6

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