Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aac22177924d53…

MALICIOUS

PDF

69.2 KB Created: 2021-09-07 22:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f39d8700c4aca269cb76f31edcdafd39 SHA-1: 96c8d76bad7d6a20f2eb110d4a01629eb7b6e857 SHA-256: 31aac22177924d5361f2eee17bfcec66eebbc90fa7d5fdacfaa1be064cff4d5d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document's structure, being image-heavy with minimal text, aligns with the 'screenshot lure' heuristic, implying a user would click on an image that is actually a hyperlink.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=healthy+food+plate+pdf PDF link annotation
    • http://ji-tien.com/userfiles/file/zivozifibarexifumifumar.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/midum.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mikurafovura.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/23586545605.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ff633b13---97234785732.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e38b5f5---kumopukinej.pdfIn PDF document text
    • https://razredna-nastava.net/files/68046215619.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee7c5371f---2374352564.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/folurofudexufuju.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12d955250c686f87e5b0a28a574c18e8/6374918272.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091037167088---pobisekovenop.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9165db77e11e0295e7aac793a5b96952/tamumotogim.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4147033c---97436162200.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce7301d509---17891372655.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/32205265273.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/80772159317.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1a7fadc22663e9d18760b94e362354ff/46906914891.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cf3c95d41---waxotoj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dba24987fa42a5deca4f62373c0ba784/23260052772.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9bbd8640bdb7b4d110cb725b7865bc8b/81237439370.pdfIn PDF document text
    • https://austarpharma.com/upload/files/zogunedaferep.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/22438735844.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13167588794.pdfIn PDF document text
    • 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_off0000b487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 14412 bytes
SHA-256: 3b247085b63082d6ca3200dadb35e00e23024c029feeee725d93979b8cb7ed7a
font_02_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10236 bytes
SHA-256: 205d0d8b47e57c1bb1d5c407f27749fe72fa90957ca37a78c432285f6036754b

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