Malicious PDF — malware analysis report

Static analysis result for SHA-256 082cbd39b6f7b218…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 06:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d931dbe9d9545fbfcc21bf391de74ca7 SHA-1: 0d007ebb379f99a7d09920ff0cc044f8ec8e0f9e SHA-256: 082cbd39b6f7b218b0c29e4dbd91ef4dcf91f1224160c8ea8834fb41b9016728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=set+up+autofill+android PDF link annotation
    • http://gloteckr.com/upload/editor/file/12536801721.pdfIn PDF document text
    • https://phr4u.com/files/19655047731.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nofunukibib.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98979065358.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/85814527513.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/4317084445.pdfIn PDF document text
    • http://ccsl.asia/files/norelipitiselodatusimaz.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7f65a9a5a873b2b61999e74c74dae35a/sizale.pdfIn PDF document text
    • http://atrsara.ir/resource/files/bolen.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55400136589.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lamerixi.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/65371073960.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/tibebidaxunexefulunosek.pdfIn PDF document text
    • http://hingliltd.com/userfiles/87372164320.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/mifesigerubabegamanefajax.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bosegasivomopa.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/tekonoluxoxasagizaropuru.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/75738468937.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vavetinudodavev.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/86492937430.pdfIn PDF document text
    • https://netpage.info/userfiles/file/ruwazigatu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac25e8bb1---64765162468.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/98904152692.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j7vbf2rjamrvh4shkrm6e8al53/52975489893.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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 10496 bytes
SHA-256: 086fc0e65d55259be3f09fca007feb0cbff0a03e7ddba3912152fc4e4b2553f4
font_01_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 17648 bytes
SHA-256: aab2d2c211b2c6f3728707b61dc6c8ad3b3f9051aa011dab6d6ac511254d508e
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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