Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cde27f9b7f96c5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 21:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be92fc226835e7680ddb9bafd562cb3f SHA-1: d8d9a64e8e4b597c254e20d430985eeb130b610a SHA-256: b1cde27f9b7f96c588f938df0ab8dc65752d0243f313d07c2503f16a07c00090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms on compromised 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 suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=how+to+show+call+waiting+on+android
    • http://okcashbagusa.com/uploads/files/52431777091.pdf
    • https://sistemagestiondpr.com/userfiles/file/wejajiwodutalerekafife.pdf
    • http://natpuedu.in/userfiles/file/tedere.pdf
    • https://mfdesign.hu/files/file/kutixamab.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v8lb2tic4bonshm803fbctcbf5/65863700570.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/pemomivimitanopupivewatul.pdf
    • http://sprinter-lab.ru/content/File/belejelevuxijosemuki.pdf
    • http://lokalizacja-gps.pl/userfiles/file/jejojexuxanubububelu.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/49921351191.pdf
    • https://xn--interpeas-r6a.es/upload/files/92104674791.pdf
    • http://palenice.net/obrazky_clanky/file/pepasotupedezomagil.pdf
    • http://skolicka.eu/foto/images/file/67528360819.pdf
    • http://colorfusion.us/admin/images/file/wiguvojuwi.pdf
    • http://muabannhagiare.net/images/uploads/files/tikisinuzowaki.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/48403942834.pdf
    • https://dobski.pl/userfiles/file/pazosi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed2e087f---dopalilefuxene.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914150038176507.pdf
    • http://df-2.de/images/daten/file/sevabipukotatozuvefige.pdf
    • http://bright-mineral.com/uploadfile/file/2021091800445327.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bc473pcb13sssfeql2osq4sbk7/zifujomerevasabanos.pdf
    • http://geomanteia.com/userfiles/files/xapatefaroxapelat.pdf
    • http://master-vin.ru/files/file/vozurajosiwamubud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfff.bin
7b5cfde0e5c19ab5fe7d412f6b3bde5ac381944eae3e78ed67c5b3e1bd8d16ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 10596 bytes
font_01_sfnt_off0000f7ee.bin
7374b14574f7f57f96fb25c7bdf4b864ef76a445935f8799ebb8ce0ce3d85d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 18556 bytes
font_02_sfnt_off000127a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 16792 bytes

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