Malicious PDF — malware analysis report

Static analysis result for SHA-256 2301f085885b5e92…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 19:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8023669f3cb9c463cb19d2d9a4ef18d SHA-1: 49e0cbbb90121e3b5cb16aec920b1128f98713e8 SHA-256: 2301f085885b5e92e2d7251d40534c3ebff3a43af0cadfb5062ac3ea505dd930
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=how+to+make+a+manual+beer+bottle+filling+machine PDF link annotation
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u294d0nn66i855irdil2rhvt1/romerepumukijifasarew.pdfIn PDF document text
    • http://short-story.ru/upload/file/62739191224.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gobalowovudejuf.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5f9ccdbb8764045a9984164b78ba4c4b/lojasisoruwok.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/puwaxupurilenenikorijije.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b38f19d1967af81c738e5bde36fd2d30/26033212029.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a4a3d1f2---buvoto.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/98491230646.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fopudizesil.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/ziteno.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/33497160838.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b9430851---87125418108.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa1675058---bikifede.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5af6f941---votigikidakowuka.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/bda12fd883d5888695dc7b686dafe363/24167418937.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/24381984261.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a95257829---92785333649.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff594e78c---2137959579.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/zosogusevot.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/tasuwojazurapinofuxipomi.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/7630057535.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bd1c7ae0---58057645983.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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 17828 bytes
SHA-256: 5f05ac2d3c96487d1c1cc211f5b139e4194d723bfc20df251efc078daef863c5
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11024 bytes
SHA-256: 5319eb97cb60dd7864a4862ed99eb80ecb1e4d778ae9137538896d398de0d5e1
font_02_sfnt_off000134bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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