Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3e38f7dae44faa…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 07:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f3117a3ed936cc8e2cc5d9101a83922 SHA-1: aef75f72df4d0c375b0097ed3c83973a7fb89c08 SHA-256: 3d3e38f7dae44faa359ebafd1fe71fd6741dd29a2ffa158fde78d057528edbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While the document body is heavily obfuscated, the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e89210a2b821a68038fc012de25ab124/fexodoxibilumosax.pdf In PDF document text
    • http://www.ondebiz.com/userfiles//file/nonidub.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/74958385423.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d21383ed5cd660628e2f407f539d8949/65769248901.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/31797083235.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosikoledofaniwobeso.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/43846616317.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ed9ecc9efbcf2eb54d9fb7bda84a50b9/3642601253.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/64339972418.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/pododuba.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5fb53a20206247addcf7495628abc68e/57350155103.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/gotaw.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4bad344a---jitagotipin.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e337ac59c19d2c572f68712af92cec52/gixisirapux.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/ferubuzemunijipesojexateg.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236c5ebc747---94332951609.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ca5d82ce37dd52e9606fe40114e92099/zofok.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085865fdd48d---vefijo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16112544151c55---65509503110.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/lafozekarojarulivagu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/825c35941f90f076616b800e4a237426/45957344693.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b365373582dd12375680cd5ec7b21028/sawexifipazaminasupif.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nigemipifogotofova.pdfIn PDF document text
    • http://gibisch.info/files/files/xezosimujezijuvama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=social+entrepreneurship+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_off0000bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 11124 bytes
SHA-256: d4fcb1cf4db7251f422e9e7155ee4c688a75cc36cd4818255d63663046647920
font_02_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 15004 bytes
SHA-256: 49f5228bd9330bec96ffe36ea3ce473724960e2aa8d02bb1f4cb2dd03087b23f

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