Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14f90139f31f861…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 22:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 46feb2a25394ed4501bf35af0aa4338f SHA-1: 8f2ec223767281f1edc36eb37f9abc296d6499c3 SHA-256: c14f90139f31f86130f50b6e6aef5f8fed1ceda77eb120d17def1f1ccf2d37b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various external websites, many of which appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the URLs are designed to be numerous and potentially disposable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=android+camera+location PDF link annotation
    • http://szkolka-wiercioch.pl/files/file/80687073991.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/28972208020.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/liwusupot.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210914015842_y4yi6g.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/4106911866.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/benaxodorogowidiwezo.pdfIn PDF document text
    • http://clingac.com/d/files/8267259984.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/sowobadawujawawas.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/muriji.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/guwefuxovefelix.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/18750268597.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/26105576693.pdfIn PDF document text
    • https://angkagenap.com/contents/files/kiwuxolopabegasad.pdfIn PDF document text
    • http://hrudolf.com/userfiles/disozunajozemorafawoj.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6e5i3h2ov6eka0och6t078srs9/dopoxovawodoxobagubapa.pdfIn PDF document text
    • http://belean.pl/userfiles/file/31663984182.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/65538736613.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140db149c37d---zazomovedutulerusevewaji.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/75590732677.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9861387914.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/95a8b65dad24369162520cd73a26c0d7/sepamipoxonemevupumedeba.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/neus1kdbktia9mv5jhrp0gm8n7/tixumajiginolit.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/85264096318.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/xopufodikimivone.pdfIn PDF document text
    • 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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 10344 bytes
SHA-256: eb86545c4655ed435249d4224d77ead015ffd4828082aeb9be800434ef7ed6c0
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16800 bytes
SHA-256: 6fc7ad17af9acad9ca530c7baa24bf13582b6c01090140f54d058c2800ea4927
font_02_sfnt_off00013480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1