Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef731d829e5a2577…

MALICIOUS

PDF

100.6 KB Created: 2021-07-02 07:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a1ece21490a3aeb7015c975232bb79b5 SHA-1: 983848006e86814d5f60a7c6dc5c646a1e1444f1 SHA-256: ef731d829e5a25775a7e2ea393e2d9a06d76eb174dca267608ca66c39393ecc7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to trick users into downloading further malware, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ch52gt9m8b0rp3tcpvhdnaj367/20310800579.pdf In PDF document text
    • http://pensjonatagat.pl/userfiles/file/8032365116.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b73775f0---3702376523.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2ce8b4591d64902cd22b22f23a38519/miviro.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nib3fb97rtnln1irh1naaap0j8/92232320951.pdfIn PDF document text
    • http://goref.ru/files/file/68965774744.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bf7e819e9b4887edfbd6809facd64ce4/33941213159.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed67ba543b---45902006062.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8061991c---mupifukuzamudetu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/14399492235.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/nosaxa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/89993376582.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/41462412328.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/7784315671.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fakumumesevafaj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b32d526---nuvazuxoduxukedasamexe.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/74473433203.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hfsslf4de27qi7gflq6nadhuk0/gemino.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baf6d4e875---vujenanipawefu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c110755a2---52213436535.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1245d6d24a3ce7bb0e76912fde2a1084/55997812165.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/650d90e405290959d89a45a5e664ee06/41995129373.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c9fdb346---rigarisepawofixamepop.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rajunujajuvurilisojunaxoz.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64515016567.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c27211d12---86666694887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+muscle+gradingPDF 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_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 17560 bytes
SHA-256: 473b02d157b7d5a918e4214456ab98066c3b08106f45f314650a8182875664ac
font_01_sfnt_off00015568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7F 10588 bytes
SHA-256: 88adab16a1591d36f7c4225583d763b5af6b2fdd21b0bc5082021a2c61d42126

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