Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f16aad7d9ae1a0b…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 08:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c52a8d9b20442ce87ebef8c294e248 SHA-1: 6b899d33a3e775c0665b4dd35ccac99ed61a94fc SHA-256: 6f16aad7d9ae1a0bd9a7bbd8133551acbe56569f452655114be0da5c93afe758
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://scbczy.cn/up_files/file/20210606_062229.pdf
    • https://anmoul.com/userfiles/file/banukulitasis.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d028e3c4c3---tabenasisetubumuxidutes.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608533425246d---disujetevimanakubog.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/pj545lhdjfhsagu1hkn0ft5e35/xalesatiziwutexomexu.pdf
    • https://xenang-mitsubishi.com/fckupload/file/dipixitigu.pdf
    • https://atcotourismtravel.com/userfiles/file/sepolurozezomuru.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996967323a2---nafabomoruwenativojulob.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4n8th31rntnjfueb5ga5u3a7c2/pupez.pdf
    • https://moveo-sport.pl/userfiles/file/85825951461.pdf
    • http://www.findvoters.com/userfiles/file/dusogiw.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8ch8n822dvc681d75puoqg7cl7/34143021013.pdf
    • https://turbooto.vn/upload/files/10752942739.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/5542414963.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bpg2dbp05s1c92du2lbcu2dhc4/22663786945.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a66b6a8f---53537669391.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371585a75e---votabavegaruwozanif.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da24212f78---waseremelisinatemu.pdf
    • https://zionapostolicministries.org/uploads/file/nisajatetu.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/potexamaxelikojonalu.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d22e6f4fd603d017f49cc05ce48050c/lufuwabelupesofixaloze.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/98a92d82229e13300c34ad7f695bf74a/90878821858.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a56566d20ad---lexidowokejogofawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mission+impossible+song+mp3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a1.bin
f6671c200e6bc29d8def21526e5fbc776b7443d455590bb679c982e286e9dfd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 17540 bytes
font_01_sfnt_off000107c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
font_02_sfnt_off00011fd9.bin
20d3a3807eb131f26d561a8ca02c6dbf28afb2e4953b273498c58fb093796976
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10540 bytes