Malicious PDF — malware analysis report

Static analysis result for SHA-256 243105b4c380abd8…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 16:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2b158fd100cd752b1ba089d34b8405b0 SHA-1: 6a8aa65f704e0b9ce19ea8ee6c90e6f5c6842e20 SHA-256: 243105b4c380abd83ffee1eb28cc193a030923aec0a0eb3ce32839c8710caf10
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pistant.ru/uplcv?utm_term=another+word+for+hence PDF link annotation
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/lonmmgfpi50sevppcq9ltutu18/zuxubizijakuzefarug.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a09d4c94d9942c5d23c98241607434d5/kiteli.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4fb0b881---92460933053.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8c9f33e1---39824201938.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50e183285---31808950998.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68roa9h1prmt6mei4srq1p34dc/sovomemonubuzadojafon.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68c28099e1---nadedawu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8de046e---37762024854.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/74545885150.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052501505696.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/poxikovotusilutuwovosuja.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b33518924822df12f5c5d2387979eb9f/46699881694.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tjqe362bqk83ekr0ublomp0nk0/35098074113.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/79113012366.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4b6d92dea201fb4a295ae627e088f7f1/90481933309.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a835c661ff0---81629832629.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/51479748369.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/37971052007.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9a815831---93248572046.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/b1k56vc082o1mlefj993b86847/31258267547.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b0ba4941---93851172852.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce143edb---tixeratimu.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n4rq6rmnk9k1kojatkeipd94b3/feradabav.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/28aff455f6443bd31a3260bb11428b22/putawilifezekusolab.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/8285041334.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_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 17304 bytes
SHA-256: 38414d6413725fd64334afdcaba03b8396dccef4e7a75c99e0638fd282a221ec
font_02_sfnt_off00015e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9E 10172 bytes
SHA-256: 216c27a6f9e4df625f3b376c649b24c4714e144e0d41c8ef90a88ac12eb90261

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