Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f9aa018583171d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 19:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f854aa92bb225b960903c326af49f36 SHA-1: 1ba91c1ec56320c370d7f00ec8c5383b5953e8c6 SHA-256: 80f9aa018583171d3e29556abba5fe7d506a18367fc50715676ae1d4cab528ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple external URIs, including a link farm hosted on compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=launchpad+for+android PDF link annotation
    • http://dorp.pl/userfiles/files/gugerimatamup.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/27868211166.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/delavisezodetitusuweti.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/97040850871.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/puzoxedometokiluludapofu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/92971608901.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/36327027920.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7c9c32e1---35199533136.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/jinezab.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/7922950458.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/2520116057.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130276a51608---majupok.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/27247631336.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/sugigodanegezidifukawo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lelepevejivitenizibu.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/83477340116.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2dcf8d2e709547130aed693c6b9fb9ef/wusefarolofevim.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/69758212837.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/nofida.pdfIn PDF document text
    • http://camonetinternational.com/files/file/59184134791.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jeropekiloxedokitiwugotol.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/firuvigolotibodesedi.pdfIn PDF document text
    • http://emeat.ru/var/files/59751493563.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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17296 bytes
SHA-256: 043b4833d3399bd1d7bbeb57e1d63ac735a063de55e9ada7ecfd83b495a7adfc
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 10332 bytes
SHA-256: d46c8fa9d305523400508a98be6c5d7a43b03d84c5e385e7dabce9cafff41318

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