Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b5d0711bffb2d…

MALICIOUS

PDF

79.7 KB Created: 2021-07-27 20:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0278a1b15d0cd2f0f7c7c4a7698afcd7 SHA-1: 52231c4ba6d7bd90bbe0a6c2c9b606930b7344b4 SHA-256: c90b5d0711bffb2d1c19cf2c5d9f1901b73bcabedd2cce120874c32e766fe260
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0aa67252---kidawekapujusake.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c906b0cb659acca850a12a036b41f331/17753200298.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/49832414821.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808587d8d09---guwipugoxad.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/bopipazuk.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/26d730b2727692979cd5b41ee1366fc7/89696544422.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085439e3dd75---56584042507.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/35782594135.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/makesozekisofufurunabaf.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f076d5dc24---77576388223.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bp0bu790g6dvclv3r32vdth3p7/86892684095.pdfIn PDF document text
    • http://xtra360.net/campannas/file/6609333030.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f51169e20a8---12441572311.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84554b6e2e---sadinuwogusodoxivota.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8590417464.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/02265ef3e3bbf91db5b840d39662584d/fazive.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ead7587c---43305896504.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/levuxirowivifarutofi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v08nr5peb0j7m3e0j7s6i8u4dr/lubozexemukuratafusan.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/11852226846.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/74786891517.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nogobowegam.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072778c8e050---63027949578.pdfIn PDF document text
    • http://vodnik48.ru/content/file/11559992753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ankara+oyun+havas%C4%B1+2020+mp3+indirPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 18412 bytes
SHA-256: 0235e80c4055c17e1ca90d5c85741a80caa53a67fb2148c57d489dd1b45340d7
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 11192 bytes
SHA-256: a1e323e47cb2bb2fe8751147a087a2b69cd6e74bea387cd53e9db0874dc60b85