Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ec0bd3438191d6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 14:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b1330f3fd87ee98654fb2d759786bd1 SHA-1: e55eb37ad0641776cd50b49febd71bb49fa7ffb3 SHA-256: 31ec0bd3438191d607e5f8fce8b170b7718455ae5f60a1582c40aa957f6bf022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links are designed to redirect users to potentially malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=trapped+nerve+in+bottom+of+back
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0e5dda45---wojesibepatinivizulum.pdf
    • http://historia-bfured.hu/userfiles/file/6442695742.pdf
    • https://eetravel.net/file/xisukebi.pdf
    • http://alnoorcity.com/userfiles/file/wofojosuwegud.pdf
    • http://uci.ir/userfiles/file/lemute.pdf
    • http://phuongninhphat.com/uploads/userfiles/file/nibenu.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/be8096193fe2202e0cdaa2a04001ba68/tuzujituredexoku.pdf
    • http://heizler.hu/files/file/13735222711.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/69398897250.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086dcc53fa7a---49222580482.pdf
    • http://cuanhuaabshanquoc.vn/files/7342839199.pdf
    • http://adhdesign.de/userContent/files/20210804073836-82359195025.pdf
    • http://newdimension.su/userfiles/file/nubawapasudin.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd7ac61f6---87881466956.pdf
    • http://morard-mcf.fr/data/Files/givemidiwelikelolewileva.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a1d6fadfdcac23a3c216463402a31bee/lazilibe.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8545156467---lesarixufuzaguzi.pdf
    • https://abyway.lv/images/ck_images/files/56549566846.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/48931791735.pdf
    • http://3suntech.com/UploadFile/file/20210831082141622.pdf
    • http://currycornersugarland.com/admin/images/file/fezuwi.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8rbqi23srg6eg5pkl7p2q1vph7/53627832162.pdf
    • http://meimagedance.tw/ufiles/files/xajesifexeziluvedoduxupad.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_off0000e25f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
font_01_sfnt_off0000fa76.bin
cd93ff7fab07a180cf8e56451fc3fcb55551dd5dee8e8c245055355a02be0d77
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10828 bytes
font_02_sfnt_off00011337.bin
9d9eccae68b5b4ff7cc87a0a28dd215081184f01531a5f6a54e42dfa4a36db1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16940 bytes