Malicious PDF — malware analysis report

Static analysis result for SHA-256 7324a41f411e4ebd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 03:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2a0fac8479fa3ef1aa5cec03a3bcdca SHA-1: cf3e97f0ff7d9a6ce026863749b78fb87a9e66fd SHA-256: 7324a41f411e4ebd374d1704c4c7ba3cfd6bba977b72731a6e3d732e2967d63d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=create+qr+code+iphone PDF link annotation
    • http://hanboo.cn/Uploads/file/2021091810265470554.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/dunur.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/kalunibinaserudifab.pdfIn PDF document text
    • https://angem.fr/userfiles/file/55174152410.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zosuju.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/52f989a0a1169bccba8afebf087873f9/muxejiziduwefitunovat.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jikew.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///rulibirakagodepotu.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/12501545853.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/95718735226.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/47391330127.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630588653402424267.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/vegabekopudi.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lijisabepalefopesupamogu.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/lotamifavegufet.pdfIn PDF document text
    • http://cycling-software.com/files/file/41836867814.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/zagozelajivimemujomew.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e1c902d18ee384b94f0709f9293de3f/busipupudoliromo.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210912083434.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804213533c---jasozilitewanasilokur.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_C84110E515F5D190.pdfIn PDF document text
    • http://talleresjpg.es/img/file/likepeluwamasorizizax.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/30051685883.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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 17640 bytes
SHA-256: f1d9c9c47fd1cd1e63a3b8609b48fd6b983816cb7e96696761948c059de3654c
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 10572 bytes
SHA-256: 63ba24d977ef0f048707695d2c3c0600e8d753f7a2ddbae7aa0dae7756c25f8e

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