Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc84c9b363c24b9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 09:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7889aacd9402b6651bf0085cceced2f2 SHA-1: 3c3aa87794f5d637d77eac48be9ffe48743b17cf SHA-256: dcc84c9b363c24b9c7fc38689f5e1995613bda6c6eb64a7756f8b6d06ac78ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm on disposable hosting indicates an effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bpabv.nl/uploadfiles/file/tinakorul.pdf In PDF document text
    • http://ucokampen.com/media/files/66849933169.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141975a435f6---465390963.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/79005406600.pdfIn PDF document text
    • https://citronel.com/userfiles/files/51785765363.pdfIn PDF document text
    • http://ustunongel.com/image/files/79813642778.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/domoresufuzarosi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613024b8850fe---pugemoli.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412a5fec3e7.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/61c2b7a8e84b1d566536f08ff08d06bf/8123816017.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/subiratejusotudinufadufuj.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pikewunijelusobarumatag.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/sigixukinumeseza.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/523380a5c1d7bc2db0edddfa38aad1e3/teruvufowolerani.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/67495707936.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/38958908779.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33358360273.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614122aa754c5---6110897700.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/nuzovudivovubi.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219151527599564.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelawavozerexom.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a9f1d367---12049370900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+minecraft+pocket+edition+for+android+apkPDF 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 19528 bytes
SHA-256: ff0563931d233d0806e9cdb6e8e0ff734cac53734d98d9a5a182bd9b1a4201c7
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 10792 bytes
SHA-256: 4b1beedc708ffc3882ed7586e2b0bf44a7a7b3ec660c9cd8046854ab53608125

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