Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fbee98b4e73922…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd997d42cada9361d8284d57ec5a9d4b SHA-1: 8c5194f4f6b86cb8d721772eaff207ef1b4c0986 SHA-256: 54fbee98b4e73922738064995646e8ca642cc006cfbe85148c0885e72d2ef0f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest it acts as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=free+check+writing+practice+worksheets PDF link annotation
    • https://p99.tw/pro_pic/files/55784116585.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1d540f9c40e422a9e0ef3421298fd107/puviloxujexonifibudiravi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/dibalabujonajewut.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pepopelofetomegak.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7fa1b2fc7fc20a47fdeccb92a721590f/81867234728.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/61488316681.pdfIn PDF document text
    • http://lulanjina.net/upload/files/57021892026.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pes56g1urg695kdo3ehl22k387/54532878523.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f8fa7084---4985683438.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/06017e7c8a70b11a268f4296d2e14bdb/66424797700.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90164962508.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/21600681288.pdfIn PDF document text
    • http://yoron.net/up/files/22558047508.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lhjfsl1mqc1uutkddd5mld8q64/dugoje.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233efabb1a3---36113749060.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/32207458374.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/dcd0360d159addc53552380ae312f5ac/dosulefuresu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb593a4fd---65994296452.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb923ab78---tazavobunel.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rekinijovuvesak.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/gifub.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8f0955b435cb4543c4e3089317f438f9/mubanudidufelimege.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/80655059472.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094acf2cbee9---93925359636.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c181b3c9c1d---xomegijuvirepakopamatupij.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-02/images/files/15441272499.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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 10760 bytes
SHA-256: a04b321d3e0447466cc3e4ee36c7c7c6db51871f9dd7ae7f0f9b3f6f85a22ad5
font_02_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 18280 bytes
SHA-256: 17df277b128f9e319f699ac1b0352e8173851b15d26c89cc7d6b6af7df8886fc

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