Malicious PDF — malware analysis report

Static analysis result for SHA-256 355b5ce706a01e00…

MALICIOUS

PDF

85.1 KB Created: 2021-08-10 15:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5279670c1f4817bae418a94089e9de9e SHA-1: 74d526c70635b4996bf4139b30b5374950c96928 SHA-256: 355b5ce706a01e003727534ad0eab0080014ed1286f73333d75815b523fe1a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=is+agglutination+and+clotting+the+same PDF link annotation
    • http://master-br.ru/img/file/71054865535.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/gomazizigil.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/namuzojutuves.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/75961374717.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/29742225217.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/99457148432.pdfIn PDF document text
    • https://bonacorsi.it/file/6134765312.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f310f391d---22732567475.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d37383bdc7---73062591809.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/woliv.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085375be52c2---womifas.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/waxuvomofaren.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/tafawopapizaze.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fowina.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f5n94jnm8kan200gsoh86360ug/dejopukurekitojose.pdfIn PDF document text
    • https://ultralloy.net/upload/files/13016418229.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ii1l6lmec2r533bsrhr1tu44m3/lajoxegutaxu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/51284700491.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/tomepuguf.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/99275461139.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608674eca9394---gotesomirisefa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4daae841c---69394999591.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90350480289.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 15148 bytes
SHA-256: 5b4fa2f891d39f219134bf8b2efd4f6301f2a73dea2b72590c9757adfad9080e
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 10768 bytes
SHA-256: 6264e742c630fc20143e9b902cb8253a559662736a5f8e9f87a608a26bb595f2
font_02_sfnt_off00012f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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