Malicious PDF — malware analysis report

Static analysis result for SHA-256 318388db079fc1e8…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 22:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ab4fa225c73174c2c7a10d112c93cbf3 SHA-1: 02f9ddee27f1abfd2e357148d7e10ceb122f2fd4 SHA-256: 318388db079fc1e89f1bdb8d2524f511728dc3906a407ac6b70b34fad6d87089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting. The presence of multiple PDF files hosted on these compromised sites suggests a campaign to distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e977279b6ee3e120ed4ea44fb54cff3e/76429023109.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171dd14c11---49803304351.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fipekitopesugukupesanebez.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f17f1427c96b2d9abb31f6f46e3df8f/bumavebisumipowowunit.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab817bdf---kamopew.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/70719181183.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c30b752d2a10f21bdf95bf0f8f222cd3/fiwepopigelaz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a4e2972a8cb1927f709a0bd92613ede9/pupozemilin.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d2c0105b---1302558337.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sugupugimifarikukotono.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d485aab8f---rejivad.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/79567925368.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/zupogogepogamujopewerat.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91749e7b34---46206210609.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/gizepereximomi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5681df149---67509099658.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/43911414160cc4748217ab.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/06011fb12de66fd0cc6a7fb40b284941/lukugajesefupogaloguki.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/736d6e26280f7bb2631c84915bfc3267/kolimivifodot.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/gesadiwufatugabujofak.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3aec5bbd38a745cf03a01c93ebc9c11f/lemetubotamerexavivalera.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/losiz.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/fiwutuxarajitas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=accounting+for+banks+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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 17080 bytes
SHA-256: 3de215ea97cdaad263d8e24bead20fc21dc6020011c3ade3d1819d31a2d8ee52
font_01_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 10932 bytes
SHA-256: eea148bf36c45621fac05d5f880254f8a79cc1e52d71d824892a15bdfa8e4c89
font_02_sfnt_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1