Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3fbdbcd4b4d7f6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 05:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4c1ec0d753e8d4b2ea5bd9191bc23a25 SHA-1: 06a5d46a62935d6d87b007194055deda97a32439 SHA-256: 4a3fbdbcd4b4d7f6d42ea616a8cadfea352a5638301e32197c5e5f36d184a7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://asustainable.com/global/file/53771021483.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028233c3742---22091881233.pdfIn PDF document text
    • http://specimport.by/files/files/12745234888.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e9588a259---nuselexixuxerepiwuse.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/55652798478.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/gekerix.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/letubatavibamulugisakobix.pdfIn PDF document text
    • https://maria-galland.ru/files/file/85431046511.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/rasibovejaboforelowakaxak.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/7889627259.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/66062333941.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/givinuwetugefaboj.pdfIn PDF document text
    • https://limsurdua.com/contents//files/tidivopigojebabumuzesafa.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/krfk8ah4mhf8mek8gt3kodirk5/petefufixapomipinobij.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/jitulapewapepaduboreju.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sobp1lohasjvgp31t04l42r42e/46656953829.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/97151396819.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7e3r5hi7sn0om6o046avjo91j6/93948170334.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/welixevamopewuvafi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e2079fc6653---wobejisijedolonile.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/3090780219.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/62841474116.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f334758ae72---fasibulimedojuluterifobig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=friendship+day+wishes+for+best+friendPDF 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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 10868 bytes
SHA-256: 3ca81e9ac80a10e072b61e60340943e17a4a9673fffb113a57e9046fa4c8989d
font_01_sfnt_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 15240 bytes
SHA-256: 8e3ea80a4a22c5f3ce94210fa6b17ea53fcff2002b51acafd0ba9819d45210e9
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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