Malicious PDF — malware analysis report

Static analysis result for SHA-256 9198bb5cff67d5c5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 09:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42fa9efc7659004e43f31eb54c1d2449 SHA-1: 63b2bd0c486bfce15ec05449d464b9cd0eab4e0f SHA-256: 9198bb5cff67d5c5e50a3d6a193b8b1ebb398ffd8f9cd038f0e91b4be77dd873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. These links appear to be part of a link farm designed to redirect users to other PDF files, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=igo+primo+free+download+for+android PDF link annotation
    • https://bibonatura.hu/ckfinder/userfiles/files/jeguxunaletozibowan.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/zenop.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5cb19a84da5cccd0b3c0eaa7ac68c027/tujafofuzexob.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/68249916757.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/2143061552.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/turazixof.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/98622544003.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/phm5kh9k0hcbb06c16har47au3/pogomobukazo.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/18675174650.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/ramopijemoroxezujov.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fotuvixumo.pdfIn PDF document text
    • https://kopari.hu/files/file/15022376513.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/16413287863.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/zadasobukukijexubi.pdfIn PDF document text
    • http://195exim.com/datas/files/nigakapefagovax.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/44215817030.pdfIn PDF document text
    • http://yongqingtech.com/d/files/61746224335.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fatelivonazil.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/zowejosusina.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/kusawosanerupejuvagogamu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/54403992532.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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 10612 bytes
SHA-256: 22481f02196734e06ca1b21f6e9f706409b41d7b7c91d0472bbf8d13db660588
font_01_sfnt_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 19392 bytes
SHA-256: 830053a47d58be568771e4ee8e14ef366b80f65a7dd606c19efd7c8fd85c6420