Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40788a5a0b82f66…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 05:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ccca42f758042af7d296a44392dc143 SHA-1: 9c80587db2eab38e0445fa3ec8e09c51c6795219 SHA-256: c40788a5a0b82f66b5919758027435589b073201511c74ffa898a95be82d7f3a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are part of a link farm pointing to potentially compromised WordPress uploads and disposable hosting. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 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 http://nkmate.com/FileData/ckfinder/files/20210909_2A333C2929917528.pdf In PDF document text
    • http://hcbarrett.com/user_area/file/sewomedebavibegez.pdfIn PDF document text
    • http://stl-hk.net/userfiles/renese.pdfIn PDF document text
    • http://youil.org/userData/board/file/podamosozofazar.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/82446141734.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/47817788560.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/20766190013.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/75085421390.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/jikerapivebaj.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131567a6d6a1---36433747346.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fuzebibururesaminusanirit.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad92d3b32---mibewizavir.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/wozifigawiwuxisiwikamix.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/78010710412.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f92bca400bbdc7460c416343dec13dc8/jikuporolomavalugevuw.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/xubebura.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/furifefazedofejuwugoz.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/93898415496.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/96414441702.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/67244599016.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/58508266068.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de0dc19b2c---vobevejopadab.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/56417181573.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/dutigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=structure+of+parenchyma+collenchyma+and+sclerenchymaPDF 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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 11080 bytes
SHA-256: ee04782c4d7567d5c4229dc1d9fe774bd40c47a80d012fed98a192b3b49b08e8
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 14400 bytes
SHA-256: 9f248601f4eb196cee315a6e8ce8824050e8dcf6bdd8f05fb3cc6872c6046a83
font_02_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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