Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f0ef7b9bf9d4c5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ebd01f30ec1259232ead3c9d359f2b4c SHA-1: 078fe37a0b4d2da5ae676f222650eb5ee9de5fb3 SHA-256: 12f0ef7b9bf9d4c5c47f528db60af74e0a88418d611ea46087a9c04a28179236
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which are associated with WordPress upload storage. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host 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://szaniterplaza.hu/ckfinder/userfiles/files/jaxudaxevunotapoparuxab.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57269326698.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/satasibowasaxoxub.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/59986797563.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/36113481198.pdfIn PDF document text
    • https://loctra.net/userfiles/file/41947403193.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/19064709577.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69ff85cf4---nojisowalexemomuzelevadid.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609001647b568---fujipovumolejanobevebidas.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/22712599258.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dba576a3b---38091331025.pdfIn PDF document text
    • http://chapelguild.com/images/usr/lupeg.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8fd2e37fb---rezasofoburisegi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27035adddf---71663027083.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9539339d---36578545132.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081626410504---73832066666.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/bezofidujo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f1bed27b737180a89ae8ceeb2f918612/88569078176.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/uu6oaiscoe4qqahhk0fqnnt3sv/81057813002.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cdca6e841f1edaec15fc1b09ff9a2ad4/mitinuvebelilamexaz.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/36841549883.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/34497587858.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107122308441056.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e6864277069642b9a34b0ac13ff0fc1b/17105403662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=speed+agility+quickness+training+pdfPDF link annotation
    • 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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 11204 bytes
SHA-256: 84c3588a39f36738d51e2854370965ddccebcc89528ed9636db73dce64bf9497
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 17404 bytes
SHA-256: ab2836887a41e6cdcdcbbf1818026eee9f6461386b87fc33cc846f10000f9051
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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