Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab4955d2ce5115b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 16:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b21b729897ccefcf9a2763996242c87e SHA-1: 6029283decf08e95db56dd755c7bc1707a689252 SHA-256: 6ab4955d2ce5115b4e3cf6b4744c3f6b4e1c64259e3b5a128a3348a45befa114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it is used for phishing or distributing further malware. No scripts were extracted from this sample, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://garglob.ru/uplcv?utm_term=tag+team+commercial
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c099181a27---sekejitoz.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f62b07b8f---72858656757.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f01d4e246---mekipe.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b431e5cccc---21722766518.pdf
    • http://shipagents.nl/uploadfiles/file/vuximor.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/korokuwu.pdf
    • http://beiwendq.com//data/attachment/file/buninitubopulunas.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc5956a3b---259772633.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862684aba1d---52726942324.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tujfs49v7a5fdi8sv5nej97deb2m91a3/60182239188.pdf
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/2bfe652955e6b1093d2252ab764cf608/96184466239.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/56714240242.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0142a5bbcf0c2610cb3e4b7abe028071/52057593030.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc676d5ac---runadezekit.pdf
    • http://smartvoicecom.com/userfiles/winowatozinokivuviwagek.pdf
    • http://vyveva.eu/UserFiles/File/19729362476.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/lha78eoock7085frec0ofbcfuo/warugawolipilaze.pdf
    • http://austral-immo.com/userfiles/files/50704045571.pdf
    • http://lycee-elm.org/userfiles/file/48922013905.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca7b24d96---80214718475.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/87effb5d87970ceabaf82b236c003a28/lemosanewim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 16792 bytes
font_01_sfnt_off0001170b.bin
e494d99bce4d3eb989b6eef1f7a980a1164fdbd0849261b071b9f3a21ad5f58d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 17664 bytes
font_02_sfnt_off000145a2.bin
5a4b3cf8a0ad52258ea6fc2d610c07bb1380cacf0d649135d2cd8fd7f236e5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 10264 bytes