Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae3a0a1063135e6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 13:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 937b6ab0bccda451da47dc4d931b02ac SHA-1: 1949cdf16f7f4c811a1113698066a0c207ccc5c4 SHA-256: 3ae3a0a1063135e64a6073829bec7a6a32e0bea8e1f228656bc2434efa246fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/120qr9j36lp6ksj4na08fg2vu9/bezuji.pdf In PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b152c03be672ec638aef6b2612d48f45/femofofano.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/31041788644.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9db54432---55116144213.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee44efb5035---kulereza.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5b00a3b3---xarovez.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c43e1490---51946260915.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/486cc4de3a392bcf59a1cf7f6bca30de/81018109752.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3ca2967b---26518019096.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/tagijedo.pdfIn PDF document text
    • https://attack.lt/images/files/5144672406.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/85154710828.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0d44c88d---48995333999.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/laxazapukovubikopul.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/lifew.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad835c2ed8---2523435372.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/zimejofotojorodaxexelider.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/dizodijoruzokunaxaluna.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wuwovawewagovuwibulemasab.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f2c7f2aa36c695e05eaea7cdb640aae/3296016279.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e7db472d070---nanasawezaxitajukeferuzi.pdfIn PDF document text
    • http://skisun.it/userfiles/files/52415390836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chemical+thermodynamics+book+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_off0000bd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD42 11260 bytes
SHA-256: 9d924d466e0f5deffe9d766aab534a39fefda9582ca87e072187f3d8d137bcaf
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16220 bytes
SHA-256: 5dab363b95ad807b2c4eff349e80a8d7b7d9863b0f26670df652c0a4bc722904
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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