Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc26d052bd0b7847…

MALICIOUS

PDF

169.1 KB Created: 2021-07-13 21:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c842452c0ea7e342f865f5d7fef8fd22 SHA-1: 31a6e8345799788dc445cc58901af546f5c7c64b SHA-256: fc26d052bd0b7847cb723142434cc9fb292789e58871e91dcfa0b3b24d806570
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://archism.ru/uplcv?utm_term=deserving+of+meaning PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2cda14b1---55048334446.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bd7f695e2f69ab4841d4d4e13e02ab75/25997202711.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aca214798ee---8076727467.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/21530220162.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d758227dd6eed2fcce9f8dcefbb4e1/dotevomawo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8khvmb81lqsvntknu2qaeclldi/30437113337.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ecbb15756---51729651190.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b9845a79---busesafufi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77ce48b77---17003982474.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0638a498---gutikejadolusu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8f6735ea4e15938aea04211221a6af65/soribuxi.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/wajegetovagumakugibal.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e912615b5e1---baxizef.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fevepimabiburigutaxufijer.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9af4a4811---ropobi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb07c15099---lodeb.pdfIn PDF document text
    • http://promador.pl/userfiles/file/sakigofim.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/ratileteguxidi.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/sarako.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/pejoxonobo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/32d6684c5ac1290a7bd93b7b851eb410/lasaxo.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/54761592400.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607114e1144e7---50745842926.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/36680149713.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2034E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B5F 19468 bytes
SHA-256: ecd707a379f4d386f58dba7deaad9bb3a9920338b3807cfb54630164e008ce28
font_02_sfnt_off00023cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CC1 10480 bytes
SHA-256: 33d6ec2b768f1c93a67921a95b77edcc77bcc9a11a9daac04f51c3ae896562a3
font_03_sfnt_off00025496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25496 28996 bytes
SHA-256: cda5eaedf56cc13b1b3fff48d2d402f18a3838a5e28b9a6529fd27d44d437b36

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