Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9fb83db51bb7e6…

MALICIOUS

PDF

87.6 KB Created: 2021-07-27 09:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbd0ffecfdb56b9c331f6573c33602d7 SHA-1: f4dfe3dce7528c0aaa1a9907217dc9b946779927 SHA-256: 3f9fb83db51bb7e614b2a273fca61c0e95b132aaa911b65cedbff4200732e282
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac7294f51---jelijekadofogat.pdf In PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/dukomevavidevakel.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e29e4e99812---48987398413.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccad4e094---79041855115.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/babedirafivi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/240bc4bfb81046b168652f181694955b/810320202.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/87631491262.pdfIn PDF document text
    • https://pepsima.biz/files/file/bijif.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/07a47edaa99b51cfa88a3b508709d338/59754334196.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210628120738.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/27608958246.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cd0d16d5c---68089724333.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1251dc537---5549662494.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jvrrjsa5jmkppl820rosp7fgj1/xemenanizasaxumog.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/622b39aa457fc30bb7b2c99ff325b502/51375245451.pdfIn PDF document text
    • https://guijek.com/userfiles/file/46333787563.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kimuvodijabowowesu.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29080112998.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/41458907696.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e021d975fa5---tafudimiwikupobalo.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/56499608890.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfa666df9---44970010484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=que+es+un+resumen+cuadro+sinopticoPDF 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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 17656 bytes
SHA-256: ca790be0f775b6e63fc01f8c857440d691bf4da061f5b726b7ee1a938ca1ab54
font_01_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 10788 bytes
SHA-256: 22895b934fef4d7589a890322f40a1a3af29c1e1faed734874c2833ec59362eb

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