Malicious PDF — malware analysis report

Static analysis result for SHA-256 34baf7d5bf53a143…

MALICIOUS

PDF

107.3 KB Created: 2021-06-28 08:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 919dbb682fb167d50493f1062a7f2df6 SHA-1: 4663c9248031fe817426b1c224223fece3d6b034 SHA-256: 34baf7d5bf53a143515034148f515b0bbf9f4f0e2fc86ab7c6841a9958881f0c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ketchas.ru/uplcv?utm_term=my+dog+is+dragging+his+bottom PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc025ac503e---zomakesavisemeraro.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/54889548510.pdfIn PDF document text
    • https://coatielectronica.com/files/99203015139.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/bujamogowijawizomifix.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6e75432259076b2ae32c0d02642bf5f/womexezonux.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tumibuleradujibotovitavi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i27i48icermlcknvd67ude2eq4/xawozujatawinad.pdfIn PDF document text
    • https://tangente-mag.com/img/file/20207274582.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/39528091328.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/gonagupejaxotozobevafap.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608438ec79d9b---senikabuwezojapafuzodasal.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/somikopefizozeguva.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c02c9ee3e---33194403259.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2332ab45---wotumugugejuf.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b6c8eb74---rukitakizi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/44625519404.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/wekofubutopasapapax.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c475e89a750---xexofone.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b99ddae59---71792111339.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b8374808b---sivililurafex.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3fg3jg00o9uf7tmnrq03eu4km3/37760676185.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/katisimalurij.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/nopagegepaku.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/5192135553.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_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 10764 bytes
SHA-256: eb4983427fcc431ae044361781e8a266d51d45ac819003867a581456eb5eb26d
font_01_sfnt_off00015a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17282 17336 bytes
SHA-256: c7737c875c418ed9b0a9bdb148eafdc68d30850a3c1a6e286bfd523cd5c26450

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