Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c381dc31a3c684a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 19:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60742a167591ae77dcd3301523dfe0bd SHA-1: 6292e90d617a0c96df7e7ee1f81875a45da9353c SHA-256: 8c381dc31a3c684abe4916ef61bb5acff7ea6afe6136610a383e40eee08a4523
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites, likely to distribute malware. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content, possibly disguised as software or other desirable files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141765e70a39---letasivajeduju.pdf In PDF document text
    • https://namratalakhotia.com/userfiles/files/99286144053.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/bugukerunexibele.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kixeg.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/werutetapetenudetoxoz.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210904053106.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/mafazedexori.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/xovuribavedisoxoz.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-10-56-15-79.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/tuseduteg.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dizevapo.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/bebanokuvonafujawunul.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb7d36d06---54643361474.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95817567285.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/67244769264.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/58113756516.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/retejenuguxibemewugedemet.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210916_F70E5EA8D1DFD96B.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/metuvimepisureferitono.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161317f1dc261a---13221235683.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/43910334672.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/tusebok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=marvel+spider+man+free+download+androidPDF 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 10704 bytes
SHA-256: 201486b73d2c83378170113e94d6e0a13f36731c4e2dcf44a7ce48d9cec60685
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17364 bytes
SHA-256: 3f4659714f6e125d16d5031126148e1b7e70611df531952ebbcd3f0135a4c8a0
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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