Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c07f644a3ef585…

MALICIOUS

PDF

73.4 KB Created: 2021-07-20 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67e6362a732f1e197450f894937d709c SHA-1: f14439c699afd9b57fa4ae9de0cea2153fdc5c8c SHA-256: d4c07f644a3ef5855dd6b7648f70603ef1bd1424127fc06eaddc1c567525c887
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting indicates a link farm designed to obscure the final malicious destination. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

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.
  • 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
  • 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 http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/sagumosirunavijigexuta.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b7a9088c256262e3492553b0696d48cb/nelarexinenuzi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878877cb3a9---riwenuxunifokaxobop.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bea79360ea4---1898874808.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072564a69d0d---97022674985.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac036c1fc---83241468402.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdac15b4cb---12364410307.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074d29e9082d---mijezigekemefujusedubu.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/50977032497.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efad631b6e---43337140015.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0c576928---53390755113.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd3b17852---50624123060.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/81716163363.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vga68pqgadber4h4s6tamvvq70/68535606162.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/45933438785.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/fosoz.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/lovadopuwor.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/jamaxofobesen.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/65da65e49b6c700fac5b63db35fbee72/54845755118.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/2429310636.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/70181823026.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/afd12f621623163a57d567b2ef3d4148/11478314260.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/d9n7vc9kvrff5jve5bg8tkklu5/kagumukesederazesop.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5d48f67040712fbe2e0a02298d6c0b68/kikosejijupuleb.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16206542219488.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/lupelomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=new+year+2020+images+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 17488 bytes
SHA-256: 6e11f7dbfb8ba8b32998a9e5496420892543c95e1385d5e05f1ad668c27584e4
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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