Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82f635d91945a4a…

MALICIOUS

PDF

103.1 KB Created: 2021-06-19 03:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 753531c63602f7ca93a3476230b94fec SHA-1: 18df8c1b70406ff2462c9608ee895aca00515bc9 SHA-256: d82f635d91945a4ad2c00481da181348ae3eca9d5396ca9d614ed830e67c28b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to religious text, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a84356d61a4---87639733342.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c58dd704---xufaneromujawotenu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160776b76cd842---94291026619.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc884c008---73950453266.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078690cc7ba3---83381876405.pdf
    • https://fontaine-eva.fr/userfiles/files/wosatenivotebezatad.pdf
    • http://akkoryazilim.com/userfiles/file/vabimawufinigelexutavake.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/70aad113276a98b851560ab26c74b6e4/86825480821.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jpi3l82psifk1f4si6m3gn0mbe/91587889909.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/7297f2c8595176067406691543183dc3/26796053977.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e71e2ab7bc1bae18c6cfc3f96373d82f/dananem.pdf
    • http://ecohost.ru/pics/images/file/89259974956.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/986a4933b740734fe3cb1df34eb0e9ca/28702656844.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e54b1f577f3efabc8cbaf5f200f133a/32718518932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=attahiyat+surah+in+tamil+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015a3d.bin
2b9cbf066aae11834c775795ff2d8d0af932d81663f5fb1b9126542f93f13dcd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15A3D 29396 bytes
font_00_sfnt_off000107d8.bin
3065d65bfafc95e0b821a302767e63333d0396f4db862e66a2a71de442be4e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 5372 bytes
font_01_sfnt_off000119f9.bin
e462ff9226ef264bbbd6ed657b710bf1a8a0dd79243e66eca55cb8042d924d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 9308 bytes
font_02_sfnt_off00013369.bin
28c8c7d4a1338d97cae3ec7a32ceb48d3d18fba5b5b08a1e27fdc2e2d8862908
pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 11392 bytes