Malicious PDF — malware analysis report

Static analysis result for SHA-256 541644ead02b8c0d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 19:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c24f0ae48444e004347daddcf10a3236 SHA-1: d05bcbad4e87ec6a49594431710a2a66f2270a32 SHA-256: 541644ead02b8c0d02c2b22741fc2075935627324e4f8c796c3bd3dad70c500a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bptramptour.pl/files/file/delupe.pdf In PDF document text
    • http://chinasoftcore.com/userfiles/file///2393260768.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/81892289608.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/65122807614.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/renepitesuz.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/85034346353.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/fovofijuzipaso.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/68c13b908ccb3ae724f820971a440873/55471896972.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/47848845346.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81561011319.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1f035fc---88273226217.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080215372438.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ode84pbmod3aodpjcufdbbvfs4/lugixikavopiwajomasa.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/letububolazuxaximi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dpp0h3q9fe3d5qnrsqn4f75l5v/lobida.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/84343444435.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c1d96257---kozefakimerije.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99c34a15b---veniramipitaxetekikagem.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/60892952435.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473253c9e---44804193825.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lazexaxifekafaxubi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/76093043976.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e02cef8a1c51c9dba7c5f893466d7593/45112831220.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bd6749a0---jekininezitoririxaduva.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/60904786826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=world+seaport+list+pdfPDF 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

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_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 17824 bytes
SHA-256: dde9b22b7d62fb062e040c60473a773dfb6b6121707b5e30cbab5b02ecd37a47
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10380 bytes
SHA-256: 53a2e0d20da4118b4e8ad3e5423f2d1c93a198ea82cbc3b6de1feb1421f48aaf
font_02_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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