Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc95a9a7273e2c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 21:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3135e823140beb902958b6b2c61ca763 SHA-1: 771e12a443c06d5b3f059eed0717551569a142b7 SHA-256: 41cc95a9a7273e2c7a607fd8d51054a63bc8ae2618f76dd6da26b7f5278c6824
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drentmedischadvies.nl/uploads/files/minawuferazajisot.pdf
    • http://autohondl.cz/userfiles/file/35884319696.pdf
    • http://www.mostenpo.jp/userfiles/files/xepejigujoxov.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a7sd1aj0u1b4nemdlao9euf4d4/worazabezuliduzav.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb28bb452---xexevegivivadavepepu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ff6d0cd6b5d0d1cfce3464ce765632ad/5263559204.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/11266130155.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca067181b---28206373904.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b420a753ddb---dosejir.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790123b073c---lodivogul.pdf
    • http://budohurtsa.pl/userfiles/file/92282265180.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/tejukorowudunejaravuvose.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d541b98e434e3ded2c99ee04974e172a/31074440469.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fe2914fb---pekabejezafinulexer.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f1340bd50f211b6016412eca85033b9/toxekafis.pdf
    • http://engineersclasses4competition.com/files/others/40570269533.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdf
    • https://braindevelopmentmaps.org/userfiles/files/wodov.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe16f8de50---pebijodotidedoxazasidupas.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078867d35d5e---93703523488.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69b651694---wonitesewininof.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5305e5ef0d---11303734643.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160852f4886ef8---71440355763.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/da98944290c9f632091e993ade58a83a/7556184076.pdf
    • http://englandmatchshirts.com/assets/file/43634968563.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eve+echoes+mining+drones
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78a.bin
35ca62739f5b486f1c7843c70d3a5e10fdcec9c9c139a384cffc7ee202f26e27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 16812 bytes
font_01_sfnt_off0001136a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16792 bytes
font_02_sfnt_off00012b81.bin
1777c62ac3d0c902aa8de02f3aee9726fb66874a15f0b64b6e914b26c997f2ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 10560 bytes
font_03_sfnt_off00014325.bin
d81ae317fde744ed7048c6b8bcd445240718063992c14cece45886c2a2f01c89
pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 15576 bytes