Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bf229d4adb7655…

MALICIOUS

PDF

116.2 KB Created: 2021-07-02 09:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d2df331e2dccb32b22f12103bfdc422 SHA-1: 411e14bd2f79222c193c84de77d9a9b185a65a2f SHA-256: e6bf229d4adb76559fc015a10f49b1b64d9d0969e440146ab41f09e96da63158
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites. This structure suggests a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=dynacord+pm+2600+service+manual PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/sobtc80p4sjativ7qmnd8j5p5u/finanozo.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/97055650355.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/55098224431.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b074306680---88654189599.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608794cea0fba---pepovegubapowogeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076957241949---semegijofik.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d740938b239---8247381068.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a791c733---gujawokosenogatus.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e905f12a---vemig.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e44b6ddc---37680473202.pdfIn PDF document text
    • https://x-software.cz/data/file/rumogolupadilamizagow.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/77e9baaebabaa2784991d781d32ffc30/16208332558.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/k8g6egmto305ltv1p88s0qepql/lutukunun.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/kokn59ga8855ljs8e5u965r991/gegodedot.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bktklbv3ojnajpghvp6ph2gauc/geromepewa.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/78240958263.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/lideza.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7ad3af6a1b7911eae4a87ef359453c5c/xixak.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zezeroleropezizewonit.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8df73bcf3---besebajuvexuselodilu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4380605a---guxetapasidezulovurolo.pdfIn PDF document text
    • http://azizolace.cz/images/file/6277505177.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ffdf0f86fd239569e0feb580261f5c9/fobulo.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/58422440173.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_off000160c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C5 18284 bytes
SHA-256: a18db3340c2d3ee1a0de5b4e1216c7de1d80fb198d7255eb2ce32747f8781a72
font_01_sfnt_off000190c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C6 11268 bytes
SHA-256: 227898c874a078b97a3d751546203b92742081b136683c823690a9dd8baec535
font_02_sfnt_off0001ab47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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