Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb18f63aeb0d673…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 20:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f408378559682ba28cd94f086cb6447 SHA-1: edeec0a9ac452120b67587f7b57b284a835c128a SHA-256: afb18f63aeb0d673c96c78f384b848e0234779ef4f0fddb1ef86d7ddcdabadaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the true destination of a download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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
  • 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 http://modernplating.com/userfiles/file/nugokigikutas.pdf In PDF document text
    • https://clubon.top/uploads/files/batinufumow.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/fujepikewepefufemiwubuw.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/kalexume.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/ludaxituxamegeniwesiv.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kodidofowulutum.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/52218214182.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/dugagiwuz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6e0e3a4099e8be6b30030c01abcbedee/66235885777.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c2b8b888ee07deac607cbf16b187d6c5/62352326391.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bff86ef19---93765296457.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d72c7831---23166605258.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jibev.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/48365680460.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d94b82e3d---85613236544.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610e64efaf0c1---7794998351.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lupigof.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/zujepuwu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/3753281502.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/35752142838.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622540713.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/gomotikumurajibovusafobe.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gunexurej.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/badodijumipiv.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210612_B6E0473BADF0C0C7.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gutemufukikoguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cropped+ears+pitbullPDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 18064 bytes
SHA-256: 64e6f3681dec1e66728438660f4ec354e9d660a86be0eb0d94d848a51ab9ddde
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10552 bytes
SHA-256: 7ffe71cb5a6c0f6138fd8c3a15e7f3106ec772959fe3da06aed878a4d8caab4e
font_02_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1