Malicious PDF — malware analysis report

Static analysis result for SHA-256 5791dedfc9e0865e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 18:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4427ffab6936fd72e34ea72b4d8c850e SHA-1: be0f8226dc830ff2b9d60b73e5095c05de4c7032 SHA-256: 5791dedfc9e0865e6f9557b536a27751835aef9b2a51ad6c6a5c21c881a4aa7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm patterns points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://poltinik.ru/userfiles/file/86632023611.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/3of1ocq2a6gh3g092hkgru9fra/5611362650.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/53289112993.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd07beb5e---15715791138.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lvucj42ioj21qv0vm0sne99i7d/bisekexizuriduvesonav.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e0610c05a07f5d1a525eaeb996732686/fexusaxalexotezevufuzodej.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/39832998673.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mapaxuzefaf.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/68428359255.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/96358879119.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/fedil.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/jinepuwisidozuweloleruru.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51d4151c0---sasuwotedizuwun.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b033b915facf79a1a53e76933f1e9ba0/55992506149.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nezanovupeji.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a45893de8fed749bc991fc86d2cf04b1/68069607095.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/deluvafoz.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/63891148580.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/75796408082.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6b7fa0fd7---pojufutomaniw.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dce7b15e---rufanulipuxewepezex.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gesaguketireginapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=parker+fountain+pen+user+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 10712 bytes
SHA-256: 42f175916a4922ced4762ecae9deb048ffef4fa17cb047160e0b262d9799e2b9
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 17440 bytes
SHA-256: d2f3fc9d456723f36132e746d7fd49080bb27d27530611bc7a585a22f81cc71e
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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