Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9fea03f6c2769d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-16 05:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6acbbc99f1c3f09f51e09d789fd760d5 SHA-1: 6e23d06ceb6cf4e438315193c382ca1f3fcb9de6 SHA-256: dc9fea03f6c2769dcafff7128082838c4e2b8b519a58845a5f0f78bd5c54bf4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host or redirect to malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the use of these compromised sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161111a3d6d67f---14046874563.pdf In PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622819780.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tixurusexedefajuriweme.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/timalu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/742e70ada2d865b64e640f2b65da3b7a/59237095591.pdfIn PDF document text
    • http://ezibra.pl/upload//file/tinosesokexezukuloxalo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/47ec17de77470ef84c51aec8b119f264/xedozorilel.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hims2iaer97t27ujun6lta66ha/96038706923.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/16807692664.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e269c926---90792379546.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/xoxuger.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kutevugafegifobipebikura.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f173882783---59952981617.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c064c953f91---mizubur.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879541a3a50---ruvowejorunamejavepuraf.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611647ce7e905---kitofimolujitazunike.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sonimaxox.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/34045290520.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/91778263949.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/29290946198.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c32e2b---mebedolumap.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/tusarotumij.pdfIn PDF document text
    • https://advik.net/userfiles/file/fimivexenadomoka.pdfIn PDF document text
    • http://sowitech.vn/upload/files/zukapurisu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbab2d8ba57---bafifugarebizejike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=will+season+3+of+food+wars+be+dubbedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 17936 bytes
SHA-256: 9d19ea99412c80fe2a0b0d385969ac0c26a7338d818e5c46339cfe76dd53b19a
font_01_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10740 bytes
SHA-256: a8d4d1bf3b84e0ca96a618cdda67fcc9a3576fb901eb38845a3f02f323010a23
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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