Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc201a697640484…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 03:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67673c81bb8c4da313030e6a851549af SHA-1: e58ea191bace67f7bb7b8bcbb72e86c09785e6c6 SHA-256: 6cc201a697640484e9ff1c315cf6e20bee830650f57a244f874a63be42189dba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a browser extension installation lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The presence of multiple PDF link farm heuristics and the specific lure for browser extension installation strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://interconformity.ro/images/file/baxoluke.pdf In PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/30029067449.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/xomoratidapa.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/9276935763.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386469e76d8---36560606071.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29d919d601b587e6b6086ea1edb30c7c/33672946460.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/togalonevixitek.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/jozafetivevika.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a239522912---titurasuxak.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/14511355287.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/karewekebu.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/62123790484.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dac65840f29a27831ad74cad93b33bc1/kigamigodadeta.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/delupupiloje.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a343d88f27e4586395edfd248496f043/54493158002.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/02d73bg0of1aqiedjn1na551qc/nuzotovasew.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/zizez.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nqdosmo3ru5138bfu7skl641b7/45360118456.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/70492122493.pdfIn PDF document text
    • http://tradotel-riviera.com/file/daredotimajani.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/13674389258.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/loguxofasafibojanikef.pdfIn PDF document text
    • http://qwerty.pl/_data/file/fiseselezefidivevakabu.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/88053240968.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nevorazukulajijezefenanuz.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/30550212982.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/60970084598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=harry+potter+4+watch+freePDF 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_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10436 bytes
SHA-256: 1abe2854a9ce0ea4cab829dbce49e2b2e94b785cacffe3b5e441651c41f35f0a
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 18984 bytes
SHA-256: 8d0835326e2054248e3e12334c79dae8842da9fbaf78b99eb05650365d778356

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