Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac6b577053779f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 00:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a35b4f7c470c522b17543be3ca3be92f SHA-1: cb63db8ecf48f0a052d28414d163c037c1fb5c6a SHA-256: cac6b577053779f0bbfa94af0868e0596e8c2671e576775b2010e2c9bb768cc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a807bfb0e7a---zavakanazemesirobuso.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f7c02122---tuxiturilenef.pdfIn PDF document text
    • http://cpviettin.com/upload/files/76668208146.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/86e59938ce9c2ab22f59a6bb8921304d/60571602895.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/zutul.pdfIn PDF document text
    • https://lordoptika.hu/files/files/94778726076.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57193201403.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qnop3rde915r6esb10gofehb15/13489809844.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e38d87df4---6045582782.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/biduturolusaneni.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/55957223861.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/najupilow.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/16790578077.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c27eb71b80c89bee0858efd80a9aa07e/74130229261.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/5554660669.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mofabizad.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/47925025010.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///23685449568.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/lugixasegesozixutij.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/90693943739.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae41349de---54742479389.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/31663f37ai76i5hro27quqrm06/63005045810.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9837fc5575e344686fffc2eebcddb386/pogepu.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/93011014565.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/55933484710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dada+and+surrealism+a+very+short+introduction+pdfPDF 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_off0000d094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD094 18652 bytes
SHA-256: 0c7faad23151f9da571e0f5b38c04370800590ffce9cacb9417e26486cfae3e4
font_01_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 11164 bytes
SHA-256: c16cb3597bce32d379969d6d5298e7716b332c094194c797f591b3759295356c
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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