Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06fcef0df9ac454…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 16:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 165ffadf8e922f7760e99e0eb46dfaf5 SHA-1: 49e064c017202c50441ace7112763b6fcabaa546 SHA-256: b06fcef0df9ac4545e3257548b4254c98aa1761a4df16b4b6b22838a52fed1e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, specifically flagging it as phishing or a trojan. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://infrive.ru/uplcv?utm_term=among+us+not+downloading PDF link annotation
    • http://megatex-plast.ru/pub/file/kofasevavuzuturota.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/xoremugitufabe.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/sogodifesubiju.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/solawulinurubizitobupele.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/1032376682.pdfIn PDF document text
    • https://asi-filter.pl/files/file/22591028539.pdfIn PDF document text
    • http://feminella.ro/upload/fck/sesuwitetifeguviwokusafef.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/62799266765.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/87020700301.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wuvedafikivurinude.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/73828554976.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/84216767219.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gawinetodufedeze.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/80283135581.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/repufi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afef1e88b5---29968994597.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/boluwulowotiwa.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/bowipemegafe.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8b6622b7e88322525025758253b0a060/kukovurigugifaxakuvixid.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29218861293.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j9qi94e47ovd6vf2rjt4nq7mn8/10016212735.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/mediganabuwujawovifawer.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/22062286764.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/kemokewurutobeku.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/98494679496.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://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_off0000b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 17204 bytes
SHA-256: 0ad5d46d84e2521d0af4e819e555fe9170dbd433bd78c3bc384639cbbb5b8c67
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10524 bytes
SHA-256: ad48aed34537585c08a591649a19878a3de55276ce96387484bb37e01bd41767
font_02_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1