Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac263da7e0101067…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 245019a2c2112ff56360e0a4a3f24d0e SHA-1: 212c945077941c134453ce9c95d0777f37f9f822 SHA-256: ac263da7e01010673b4336c6f91271f834ec95b98c5b208a23f9140fa75518de
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and does not provide direct textual lures, but the presence of link farms and compromised hosting indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://benthanhsgfarm.net/images/uploads/files/79483324140.pdf In PDF document text
    • http://peknanevesta.sk/media/file/727755042.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/duvuxi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e79kfqmb2qtlq3j3ieg1gvuuu3/lonunukoguleloxigibose.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/81848252093.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860f1ff8b---migubufilawamuseroxigomob.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/60898480855.pdfIn PDF document text
    • http://gibisch.info/files/files/64168644029.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/regikudigi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rk5uabbucm32bvghhg6hh2e5is/24326514907.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/82124380370.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48423462650.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/renapelorexoparulanomatar.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/84162151207.pdfIn PDF document text
    • https://tsegypt.com/file/97123585650.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/wevun.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/28165f6f1e946ed47931a81400073d26/guwakabibubiretafitoj.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/5845380366133c6ef864fe.pdfIn PDF document text
    • http://tianfonmm.com/d/files/19680117216.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tuwelijizosagolito.pdfIn PDF document text
    • http://soc-in.com/data/media/files/vimas.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c58712499---fobanemuxiz.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/10161815108.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/32269097852.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/38144232350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+photoshop+cs6+android+apkPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10948 bytes
SHA-256: c8ea2ead0252d81f8516fdb242c761d302eea8a7bf09853c4a9f2916b75a5ef6
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17120 bytes
SHA-256: 1b937df7e5665cc50e62c3af41762f3df5784944e7bc38d92e7094934e29e1be
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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