Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9fe46c84c5b7ba…

MALICIOUS

PDF

71.7 KB Created: 2021-04-28 17:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac3e57e04aac84b0f41d25b7466a868 SHA-1: 1a978cc347f9af7ca0039cd30897dc2393ec57d7 SHA-256: 0c9fe46c84c5b7baa6ee6de37e90f860a12d6a7513f2e785787f8193c671d983
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4ecf1aa5d78f300e85da2428acb1dc79/ruzewo.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/23d71cdc1947838bdc4838cb338e958e/kiwabajupazajuzuk.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a8c8f68a---64535584837.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pvcq79ljjlii40m5qk8hkp8cq0/depewiraropimivisir.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/02e65bad36fb5f51269b35b35ca6f81d/80766607447.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/957d75e1e7f6b6d9e5ab2783dc1d22c9/55416442295.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5239bea62---50955542324.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0069153eb324f3ef1d77c952663764f2/wutojanokanege.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/s30np93j3bkkabmgq7e8vvt8d0/dagipabazazasamupobuxasif.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3779f4b8---muzufelawogoba.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eefac47fb3bfa5fa60bc7419bc40c3b4/gixuxipoketejesalo.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/117e130284adece56417ea6127b41573/mabonerebu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca26289bcc---suxuxemulab.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d0c7a5d---vuxibux.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e2b699be1552c5cc34d10197a54d17c/polobogokewotipajasatan.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aa18919ef0b32774c22b61741242a5cd/bitupunakajatefe.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ab6ddbb46674376d6fa0d42604ca2513/xisakodepotozibimatafol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=humpty+dumpty+foundation+annual+report
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa0.bin
46f8ae37ce02dd7acbc4ab85ee18320c4187d2864e003ecf6b459aa40b3bd3ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 5072 bytes
font_01_sfnt_off0000ebd3.bin
7d0b5ac94c1bd6a4d8eb73a9a996a115ac60410d5f469bbcde3b04d6e82cc3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 11188 bytes

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