Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed2dcdba44eefb1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 11:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 250863163ced1a4a025f799210ed90e4 SHA-1: 2ce3a6ee0e5a6b3295da09e2014b5e57ea7fcdfa SHA-256: 6ed2dcdba44eefb15cbbf88808d677291aa6d3127692789d0b613288d2f269d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure to phishing sites or malware downloads. The presence of multiple external URIs and link farms points towards an attempt to exploit users through deceptive links.

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://queure.ru/uplcv?utm_term=raynaud+sendromu+pdf PDF link annotation
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/mojuku.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ug1a53727aifjpc7d5r4ld7q1/29192593863.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/kotogugatirozufomijipita.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7e87160a94f0fb10deed79866b085702/jepox.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/85005136666.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/viloganudinuzuveximiderip.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxugiwanakonupeb.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c96ecc0c5---kupofesane.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/896d1c0350da02b7222a4d30f6734d65/53293784083.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda092ac02---82954297717.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e095a0bc806---lujefap.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607236f0605b2---89009362485.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/75098467431.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e78d8474f---vanejurezifaxuduzuwedived.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/teromukulij.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/tidolimifemipenopesibeneg.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9e653ad4---wuzupik.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f082deece8---dafafodelemexitazilasi.pdfIn PDF document text
    • https://buka.ru/sadm_files/zagivarurugugar.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/63tgtsb1hog5t1grk7n8etv7v4/weriwedi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rotoragizijilerikiv.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/58259908824.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/98598740812.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc7845e242---fofubidixakiginipa.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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10680 bytes
SHA-256: e3bdd2930cbed87395aaaa81653b567d585d3cc31b2a47abd084fbac06df67ab
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 20180 bytes
SHA-256: a0c3f6e1884f8a7e2bcc65eb42005083e10ac260d4969de46b2aca549cc74071

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