Malicious PDF — malware analysis report

Static analysis result for SHA-256 35556b12dd3051f3…

MALICIOUS

PDF

93.1 KB Created: 2021-07-17 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ccd65289f1f0f03665ac73fa3efd292d SHA-1: c4f276a813174168c048d66b82e8fd31de303a32 SHA-256: 35556b12dd3051f354229ecca32e6e29e1fcf0fc45e5bc6bad6a929d27d62122
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not user-readable content, further supporting the idea that the links are the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://penzionklara.cz/userfiles/file/59440715611.pdf In PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210709_DBF7D58BBE68B6FE.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f28b555f---88493192340.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7342fa6205---xitajobovi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l1mr1pn4oa21hqov1ag8vphi8t/25892806228.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/59600772022.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nitirokonunafelojetaxaru.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nagavufebivif.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/93569999150.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3419e4ba45bf6fa5d731e6aab89bb5d7/wotupalibajumo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sopur.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715784030e1---29309999423.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609825258835b---43558032781.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5c42281d39fe9568dcc839e01492787d/10246823154.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/79656930275.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0a83b3fb---92108363501.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o600itme1b1hvfpctgvp2im32l/pazug.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/menetigutosutalunepe.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/22737850366.pdfIn PDF document text
    • http://allycatering.com/userfiles/bugaliledipotum.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5ceb7037---pafemamu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609845da73f42---75320431725.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nisidikevatoribaro.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cce88c0a9a548c3df45454c9d5290886/61217077954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+best+video+edit+app+for+androidPDF 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

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_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16820 bytes
SHA-256: c186e19edf0c171bfc6f106e5aa52bbe8403c33f4dc48c8fd4952b29fdb669a7
font_02_sfnt_off00014ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE1 10716 bytes
SHA-256: f7a5851b2b7fa85234e1d7c8b812977ba089d2cf5a6694c02387c447c32b042a

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