Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fef951bc799e38…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 01:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adcc0cbfca01813f3424e1fb4d2b65ac SHA-1: 5bc1a34c0d5b2f1481e18bc6b9d45c16131795fb SHA-256: 55fef951bc799e38f477cbdaed3bd02d88bc35ea30a79742263720b0259bfa2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758ff2b5341---rukeminexitubomuguvim.pdf
    • https://alternativecarrepair.com/userfiles/file/nonaxozojawiteworixizite.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/gojowixetuninuturisevad.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4e333f3b92454f7d8ca8e86533e62aa4/lamulovonodiwaj.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e9aeba74---bowenopidafebunanebavoba.pdf
    • https://badoza.net/userfiles/file/70592582864.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ab4e2368---78550641860.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a61c7cf22---84885686312.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074482b90f28---58500678042.pdf
    • http://lycee-elm.org/userfiles/file/95014274922.pdf
    • http://babywagen24.de/userfiles/file/vanedipaz.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be90179a23a---tozesinojibekokefawifotu.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc28771c6ae9b516cdb1955010df8863/sorotifekomi.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e02e7bd911f2b39ce841d03fbee0021c/18853760739.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b668b788---22278212546.pdf
    • http://rymwid-training.com/userfiles/file/45292841673.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0db55259---bixuxudozal.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/54e5065a9f85462e9bfe15b448d2d058/15299148348.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chariots+of+the+gods+pdf+download+free
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77a.bin
8212f8260bceae6139d5e6df9fdcc6b830e873bfb4bdc3a5a6f90e1371e80b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 17660 bytes
font_01_sfnt_off000102c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 16792 bytes
font_02_sfnt_off00011ad5.bin
7b4120824c35faad4a53ccc9a5a477a3392b103d0cb1ef2050011d64cf1f8595
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 17800 bytes
font_03_sfnt_off00014830.bin
fb6f3a4256a35c5490de5ac94575d7b682fc5dc511c7773c06915d129104a179
pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 10896 bytes