Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c816c164f296b1f…

MALICIOUS

PDF

66.5 KB Created: 2021-09-02 19:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66d933267fc59cf4b6ebe87ef0516ef3 SHA-1: 39a81e559ff9de12469861272328ee323ec2cf04 SHA-256: 6c816c164f296b1f4f5c8a10d2b16d8cbd923be6703e83dc9feedf65ffca7071
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it's designed as a link farm to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7802

Heuristics 5

  • 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
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701067cf7eb---boveke.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/40151239063.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/792514504cae489fe3e0c69ec49a0a70/joxonipukurazuvemarawa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610409eb5b981---xerizareligimavixaneda.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/89550680330.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/68e13a177cb7852cbf427b55da7c89ad/35840916678.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/lexiwotonekojovusajob.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d334edef7---90187329909.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/dc5beb6d7c34b5f1513f4b61712d4cd8/61745523869.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/retudiwexofidaguf.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6a2eb7fa6---86446503842.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa32e0458---3400623584.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bbeca51a5---71971967437.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/514aa63722d7dd9f329ab36e457aa513/nuxofinodur.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbe612fbb---26880744609.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/16370597867.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07dc80222---42282233526.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/9762240347.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759bfdda2c6---milixowidipivun.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/vikisagujosapapeler.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/81380671030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=krups+nespresso+machine+manualPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/32242768397.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 17576 bytes
SHA-256: 144bc822bbc5062a62e493717b1f74fbe2455cc39c3933efda7f570e72dc0a4d

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