Malicious PDF — malware analysis report

Static analysis result for SHA-256 568a701bde4140df…

MALICIOUS

PDF

72.2 KB Created: 2021-05-21 05:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2bbbc31c93416e0dec5b3bd6733b49 SHA-1: 4ab31737a64d3d0edcd17a642574fd2e51d80fef SHA-256: 568a701bde4140dfd30b2c7abf5934e78aaaa47a3afb84361bec39ebfa993bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised websites, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e53f1721---vomisurijemupojojexavepe.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/4rf7huef4i96uln9ftmaa8u325/2936659809.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3fc43f342044819f457a67b848ecfc99/tepuxisawuledodurotese.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b039b598285a415032ce96bae6c71f7f/9025598223.pdf
    • https://alshaabcoop.com/userfiles/file/64499349480.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gol2hfkvs02ddt70n1v3afsdg1/guxepop.pdf
    • http://nutranghongngoc.com/media/ftp/file/ruvumukoxed.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fa831d79---kurivasufuxupile.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bc1b197ee7074994b8cc1933ed41388/63140276353.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb60bd32b5---govez.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607150bf009ae---pasudipefotewad.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070be76001ec---60644970287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vocabulary+personality+adjectives+exercises+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ea.bin
8fab8448f931825102f7724741bfef62c68186a6feb2f2b81c77946ad0886306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5560 bytes
font_01_sfnt_off0000f4f7.bin
0b6316849ef2fad6963c3adc5bf589c93c2f83e33abc6e6f181e9d86741ed678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 10644 bytes

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