Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88a6847c84a5e1d…

MALICIOUS

PDF

64.0 KB Created: 2021-05-06 11:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8985159e891b4d373db8a05bdb7b473d SHA-1: c9364be1071bbb49eaad0fd40242ba7a680c2523 SHA-256: d88a6847c84a5e1d5afd3b3f2ae223b89391c01b9af4a7e492471af93d42c161
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect the user to a malicious payload. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 http://aceonlinementors.com/userfiles/file/35158339925.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9638f5ce9056b4dd7d275b7858ba31ce/49790359217.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e373bbfc0510984766ae4cab1f84fff6/72387002619.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b45ee34e6f9bb9a0a9e8f35a001ebf12/zipareraveruxusogutawi.pdf
    • https://advantagelic.com/singhania/downloads/file/74688950773.pdf
    • https://ascinfratech.com/clientprojects/trading/file/40102434726.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b25shn3ngvpcgdddl8kgmvnbf3/72867610861.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/na8nhvp9a3452rjndb72bqold1/17484760024.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/71s1c5jmgndrml3f1gmif40dcc/jiridedewabakizagarolozoj.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a644dd06a2---sunowu.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078215d09489---79523467435.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e629dae---lujizajesigerok.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f071255919---zorax.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee51e0ef5e---bivupo.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0a321d6c---givamagejo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puzizexokazawapebe.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e948c516ad---fejovarijipolof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+ach+deposit+authorization+form+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin
9059c226cb9e784aaff03a198c474092c2559a7074366d9da141dda543480124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 5400 bytes

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