Malicious PDF — malware analysis report

Static analysis result for SHA-256 21da2266fa15b560…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 15:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 669dd814d06408d05314354386b5f8fa SHA-1: 9d95c1c3deb27fbe4e8d142f00c2e4dc77a208b3 SHA-256: 21da2266fa15b560451b9bca36d17fb43771e364a6a9b64ff30d80b8e132f295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=judith+mcnaught+books+read+online+free PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3d63012d---93332935294.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a71967ed---tuxisep.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/lixofim.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/nudimuxob.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/72867011285.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/86084267884.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210908_120050.pdfIn PDF document text
    • http://xtra360.net/campannas/file/76704226169.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/16233256906.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/80130946788.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/71007665165.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8dc2ce1ffec481455139170b7abeb57e/52185222726.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20520134893.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vprqusndiiaddstakjabsn2855/gudimapivetobanas.pdfIn PDF document text
    • http://nprofit.hk/userfiles/bebijisufesubuxejoxolu.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/85558791104.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/47535852693.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/binokujabekijokulug.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jemurevojirikasuz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16151a8fd4f2b4---73079452869.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/98705313811.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zuxabatunutiduzulamusaja.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/57266527639.pdfIn PDF document text
    • https://salwangurugram.com/files/2295878400.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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 15196 bytes
SHA-256: e11e1a06616ea4a2475bf83a2fbc9f41df75ff2b92a3864ca29a48ad422df067
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 11244 bytes
SHA-256: a3f047b7c4342d6a613c154352dfc5ff1f6483d6b8198f5e69370877e946d31c

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