Malicious PDF — malware analysis report

Static analysis result for SHA-256 1541a1c5c5885946…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 14:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: facfd2d8f278c974c60ace57958e339e SHA-1: 5c63c8d8305a2fb2383b7aab683d0291c6b82be6 SHA-256: 1541a1c5c588594612474dbdc369fd002c7695c88050fd80d625146996cdbc39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=science+inventions+and+discoveries+pdf+in+tamil PDF link annotation
    • https://detector-billetes.com/Imagenes/file/14159051310.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/dirimefisowanexeva.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612603b6eb5d9---87703119229.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vaxuxupuworemidaw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6d5be1708---38086275948.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekv77at561iovfv6cjeimtb953/pixute.pdfIn PDF document text
    • http://debden.org/userfiles/file/98723754813.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57b26bbe689bcce87e5550d43530929a/zejariluzilaxelas.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mck3g9nas0jpel38sg9prvhluk/42268945240.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/941e49c202b463c3a18e2af4d4f92b03/17974822210.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/33727022701.pdfIn PDF document text
    • http://asfalon.com/__files/file/tomiwimaziw.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/76438113290.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/42374159731.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tavagerukuwusewu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/j2ieqkuog9aduvu4ms7l41q6oc/79362124161.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/befegewuwirevinibadil.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/6159620190.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160878a9cc2024---55182298172.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9a2d548ed20cecc420765ed2587441bd/7959444564.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lkljh5g0vcdgeggb00lobmisit/10463630044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 10924 bytes
SHA-256: d9fcee1a9199c8f38f3ce07f2a307c64b64dc527135af7244de90b95db68394a
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 17732 bytes
SHA-256: 0f275ac6ca0cbd74652dfff522683c3425543a26698c47d55e3323b2076609ae
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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