Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f002f131cabbca8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 23:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0740594380a4f83e4bdad8b29f22a183 SHA-1: 24380eea8d52b58bd1adc002f6e11933d25142f5 SHA-256: 2f002f131cabbca87ef8b5b624ce07abaf4ab86eadd166ad2c8762f163041d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is structured as a link farm for SEO manipulation or user redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=purchase+agreement+form+pdf PDF link annotation
    • http://onmamtour.com/FileData/ckfinder/files/20210806_8E9B3762EEF9D9A2.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c576835f7---rasuridu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/gorulisifolagirata.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/44914209414.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210812_ABF943CC3CE0B25D.pdfIn PDF document text
    • http://giwajib.com/ckfinder/userfiles/files/pigigobulegasa.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/kusejowatuxetarud.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/widopubowavixa.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/kuxovowomok.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/9371945448.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/79438705e395846cd7c30a8f0d9e5e94/jokukoxutuwarezufevufim.pdfIn PDF document text
    • http://konberdbio.com/upload/files/54731377341.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c16a14b7130---wilesiwidelujezegararemem.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/41255441934.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesorirurareli.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cff55361b0a---posidapodebolunewevijuji.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/43144174457.pdfIn PDF document text
    • http://chineseclothingonline.net/File/4310329948.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/busemobekepimepolowalufo.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/27471135555.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4dc5639c---nelavawilajetururunopimi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/83704955816.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ffd3b4a61bbe2c5bdac98a7054cc761c/77844579365.pdfIn PDF document text
    • 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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 16652 bytes
SHA-256: 787293e54e5248be8e08c7e48dc3b8c02bcc9e750e7b8d9f1ccc622cc52df1db
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11032 bytes
SHA-256: 2b262ef2c4715c26b17ae4ad5663c357772472c34b09893815c41f57ec2da250

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