Malicious PDF — malware analysis report

Static analysis result for SHA-256 bece072b24cefcf8…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 20:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 030634d53f70855409d3552fff899ab1 SHA-1: 4a2d3c64caadef8e65dbe6450ba7fe0486c3b6f4 SHA-256: bece072b24cefcf8ffccf7bb446f83182cd7d2c50228560c7e0d61954a9a8c0b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or exploits, suggesting an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/83c3a23d82c3dcc3386dc891ec7d9d77/61102245807.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/92543786187.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9269979e65---96187970673.pdf
    • https://asiarsolutions.com/userfiles/file/bixevozopeserunulus.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/998b0d328a7ace5811367c153c7d0475/13592595464.pdf
    • https://farmstead.tw/farmstead/upload/files/590506905.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/33156834962.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbdc197b6f---27434746213.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f162996d5---65954856560.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/487636b4aa9f6e07be0730c1646e9428/65737133636.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780f4c2bc81---71833020213.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a71e3c12d---30489826632.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2ed26815e---7642692476.pdf
    • http://pnmanagementsolutions.in/uploads/lovane.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b665ad0b3da8fb7e0cefd98101aad5c7/3829729692.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d522e2d03c5c972e8ae8ded45c0d2497/73369882634.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/28d83b6274f06190bc9dba5369726517/pofexu.pdf
    • http://cwesp.biz/upload/file/71174438194.pdf
    • http://pttaccounting.com/userfiles/files/37547200455.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/86343159712.pdf
    • https://citytrafik.nu/images/file/zokamoge.pdf
    • http://fw-simple.com/uploads/files/14749160154.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/53834625435.pdf
    • http://abwplazaview.com/uploads/files/69537229223.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=araba+yar%C4%B1%C5%9F%C4%B1+apk+day%C4%B1
    • 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_off0000e9ef.bin
3e8d62377dfde4e6c5fcb36925ba50f0140185d8131d78cdc22d3871e94f77ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 19740 bytes
font_01_sfnt_off00011a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
font_02_sfnt_off00013261.bin
f327d3671006d35fb23d37ab1f7c1b30a9d58fd192a65c32b556142d53e39bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10240 bytes