Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec943c0ec41244a1…

MALICIOUS

PDF

89.6 KB Created: 2021-07-04 06:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b476880f92736371e61de2092b860451 SHA-1: 8619a6aad82f90877ca4b6ceaa6777a1b054d3e4 SHA-256: ec943c0ec41244a123ed65ad8eee727459b466d7c045cc8e8f6a8e1fb30f9a8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://unternehmensberatung-hegenbarth.de/userfiles/file/taxudenolapu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607249a8481dc---bojanumej.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/v2h0nrn2r1c75il3lnitooaqd7/wararivareb.pdf
    • https://total-sport.pl/img/upload/files/wejodujirelarawetadinapa.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c574b78151285239c2ce3f745058fb3a/79050410509.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b7dbf435---60071420638.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab8804b25d---85148674957.pdf
    • http://visit-pune.com/userfiles/file/71804410384.pdf
    • https://ilcaminodaugo.it/file/29372513118.pdf
    • http://stinpo.com/ckfinder/userfiles/files/goroxuzisigawinukiro.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/nuloledafunu.pdf
    • https://norservis.cz/files/files/55076736900.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/778f26c06705d8d451311ebce533d184/mitor.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/segadid.pdf
    • http://abpaluso.com/upload/file/tezapavamibogim.pdf
    • http://www.aadhar-interior.com/userfiles/file/zanaxopiwogofakegil.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9diqi4rj010taa397gob5s1hi2/wukowo.pdf
    • http://artin-intranet.com/ckupload/files/45131897548.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83c86c144---bufaxolufumegugo.pdf
    • http://kleinschaden.expert/userfiles/file/zutemidibizivot.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efc322258---dopaxixevixepuniri.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f730782eb---xovezapolafumagatutoka.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077701b58f2a---nolovelefubadila.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc46175d---lusofasolujadakizekulorol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=firestick+casting+from+phone
    • 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_off0000fa07.bin
17af77eb9ba3dad7dd53caf919aa19cc75660ca12adf3834a6107636928ed073
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10952 bytes
font_01_sfnt_off00011347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
font_02_sfnt_off00012b59.bin
f2a9c2dde28f625b1abcdcf5bb0cfa3f07a966e8153f71555534be81a7119729
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 17436 bytes