Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec4b5d077dfc577…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 02:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eebe1a662e780952a4f35c801b35fc88 SHA-1: 2ebf0a692bc740df0bc2cbf438d312e977490a8b SHA-256: 4ec4b5d077dfc5778580d9f14316eb4779c4654fee8541f1acc0919a3305e1c4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised CMS upload directories. This suggests an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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 http://sushiosushi.com/uploads/files/32572593618.pdf In PDF document text
    • https://ebooksweb.net/files/file/senosabupapiwowe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0154ddfd---munafidutitebutawom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b294b79c805---7217920845.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/29858323319.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160856ab94b3d2---kofowiro.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/85397081cb86a82183d6f0eaaa527ada/6680251721.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/64842981634.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/12584274783.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/tevifabewuzed.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jamoniwugalafunejibegoz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/luhn6v9fg9gktln5a45j9kaurv/fapopufuzuvavimufujav.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/85583585299.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/xowomomufa.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/28604287175.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/43208755461.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ce0b3289---dulapen.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/42471146377.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/lamanumatitonofugoz.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/14025806226.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/xomuli.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/kumipifepuludarola.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa541044f8---jusorudovufixewirajuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ecological+animal+husbandry+practices+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_off0000b786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 11404 bytes
SHA-256: aa111d78d717a866eab42443449bb1937bbd9d407331e4aa1afd406d437d5c00
font_01_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 14916 bytes
SHA-256: 9fa46a90b98a1432cc0362abd16d8cc11a8931b9902505ba2cc0d62e5ed0425a

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