Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a42397086506f27…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ae41530f7d2d0ffa05b3445a50aed2e SHA-1: 6a0e7d9509c49513753c807c0ae215df17709802 SHA-256: 2a42397086506f27a450c2f1e1d2e83760b1c8a0437f588ecaff65c13cc0116c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kientrucsangtrong.com/plus/files/nabigekatezavobume.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ghvear6easpk08ls4irm04rklb/78660625049.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/60268363201.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jimowolemosuxojodabe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d397ae846---rufotapon.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/17661927848.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/1999766076.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/busatezumanizudewevib.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67e94d7a9---ladidelamepuranuboxam.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/libutigosuf.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/q3kehmjm9qv3n64pk7qt0v2nad/rizotarututogag.pdfIn PDF document text
    • https://rosycaffe.com/file/54522400186.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/vamowu.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/26076179789.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dpta9gc83u3hrkrc5mot0fpj60/97268783903.pdfIn PDF document text
    • http://anpharma.net/upload/files/21474571014.pdfIn PDF document text
    • http://hydrem.ru/images/file/wukuvokemube.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/42780674233.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7a54828433c235b083733895f3d376e2/23818077419.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/kfvd6vos7lcrfomrpamva5i4o4/kitivavovuveripuxugeweg.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d2a6ba56097428dd1f72bdfc6b35fafc/suvuradovodapige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=callanetics+countdown+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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 17340 bytes
SHA-256: 6a7c1e6d732af3914a56ae17cd22f16a1e0db34298b4280d3871fe4c66292797
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 10728 bytes
SHA-256: 28d8b74d27f3af481303b68394500b0e072ef51c84ac83129f5e38421906f657

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