Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37513a388dddf7e…

MALICIOUS

PDF

92.8 KB Created: 2021-08-22 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f32461b4f93e484c4048af0aa133dd76 SHA-1: 1b2f754b50395f5f6b4afa09b708b4c9c90ca0e1 SHA-256: b37513a388dddf7e4d36e90c3c81f8256c11fc162bded5506d96f07b0b8058ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=who+was+the+greatest+of+the+five+good+emperors PDF link annotation
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jopuboxuxilimejoxewowe.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f709c4893---musajugijaxazojovejewaz.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/budakilulobesonasevogul.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f78d6a2---wutujesorixiwoped.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jonafi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sekasavevavu.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/lamemosulesujetevi.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77e64a5d8---72977510082.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084995cb7d3e---fuwexa.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/98546452759.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/61297a3353733d964d2eb47e859d46b8/40805291868.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/sarabovol.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/51495661370.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/evcvlbb8ife52ddv2s6c4h6tjk/16645378819.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sisodabifufogamum.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fepazupafaxuvoverugepefi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2a270f44fc790ea3a423f5ac9e31209a/dovipidu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vaserujunel.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/wuwufu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiblagiopuggho7rlpoui2rkv0/migifewumejisebunajo.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/mupikotokilolonikifewut.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/32805852203.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/dixozazetumazolopagufuzes.pdfIn PDF document text
    • http://precisao.org/files/files/legebo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/3bliffakunjslf2pjjs0i6e3e8/25618652561.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 10940 bytes
SHA-256: aef64b54214506ae1f73c3d966c570acd56e3c788ea11aff1f65143e61b71b69
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 18248 bytes
SHA-256: def175da42cf1343a6fe0337efc0c21ac1a0141cf3002a13b220d99b26c0f1b1

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