Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82ab4c7d756f1ad…

MALICIOUS

PDF

93.2 KB Created: 2021-08-25 04:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edb22a3424242c6fa9eb1376a79673a5 SHA-1: 4e387242a163cb2c4b13afa1392b438ad01a68ee SHA-256: b82ab4c7d756f1ad8a6c84e7b32399095dd48a0743e975b6583af9df5f661394
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm, leveraging compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abb65ba0444---zifewedosozugufifu.pdf
    • http://tdsns.ru/userfiles/file/lewabipa.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610eff037a5ff---33783749226.pdf
    • http://cutencuddlybreedables.com/_images/file/24276150508.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a9fe1f91f---bijibejekumujowudaze.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e471586926---xenujisegojasixaganami.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108120446123071.pdf
    • http://challendor.com/fckeditor/upload/file/57800050806.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/gaduxeguputed.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d89c7ae05e8---padaxuja.pdf
    • https://sardavetri.it/userfiles/file/49059659808.pdf
    • https://maisonforville.be/documents/file/87083231534.pdf
    • http://irinaburmistrova.ru/files/vanexugozurikulexexu.pdf
    • http://abwmountvernon.com/uploads/files/pujedalakebur.pdf
    • http://champaigncursillo.com/userfiles/file/23996669587.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/795485ecb0c3ffbe935decba88d74982/42942432454.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/stgl9r6hfc6rv2fb7p0d4u0khn/pogavedagumuroxob.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/nerogodu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5381f970---19829998783.pdf
    • http://shinex-auto.com/userfiles/file/womagoz.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae358ea4c51---27140441161.pdf
    • http://limoride.net/gallery/file/9618001651.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e6f84464d2106efc2f0011555bbf9d0c/bojeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+off+my+voicemail+on+android
    • 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_off00010719.bin
205306a5ae6b8718b43c10d16e923ed5e1eb1b4a4af4b18f8d9fdedf72ce9dde
pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10824 bytes
font_01_sfnt_off00012017.bin
4b07a7b9ab88518f3f7f59f7efe305b82660ad9a66ddd25c3955d26fe72065a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16932 bytes
font_02_sfnt_off00014c31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C31 16792 bytes