Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b40fc033030b2…

MALICIOUS

PDF

81.9 KB Created: 2021-08-21 10:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0efb52bb5552fd3623f51b47b4c1b07 SHA-1: 91b732e54c494ca273db5cfd6b19c2e051c59ee6 SHA-256: c70b40fc033030b266529fbed67f8d30444c05b39cd8fb958faae548dcddcb66
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e5dcda6e0---pizewakiforamax.pdf In PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/53327057771.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/70946398795.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/97589369461.pdfIn PDF document text
    • http://robedecreateur.com/img/files/daxejujuvugejapuxisonima.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/modopanu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e5422abb---67077138035.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca26237de---33751438827.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rapizagaguwanoragipemow.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/88109078bd33c38726dfb2888dee24ef/favapexanagamaku.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c677631556e---bukisexadej.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/46163707181.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/jojewetuv.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/80258551170.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a6b7eb946---denus.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/moloron.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/24129606905.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/52919026327.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/7582255493.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/iccm2docri2402nake0mnaq1r1/vajosogovoxutawaguwuget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baby+trend+expedition+double+jogging+stroller+reviewPDF 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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 11360 bytes
SHA-256: 3f996074dff150a90c314ccd1067f680987593f1a3660571a00da9c5dde06026
font_02_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 16112 bytes
SHA-256: 9df4b846cd0c0bfd817b4bcad9660f017f5a29d69e2a0854d7509184f1392e75

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