Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ca3c341fac61b6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 05:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d5ffb379ea53ffbdd5567b705f88038 SHA-1: 6023722d4617c4ab4828fc980ca83fdb304e4e14 SHA-256: 34ca3c341fac61b6b06b5d3150ddd48e413d78d262c0764a7b4324df4ce445e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of external URI heuristics further supports this attack pattern.

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 https://coretry.ru/uplcv?utm_term=lion+mega+hd+player+apk+download PDF link annotation
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/41776949501.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/dusax.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/fipaliveke.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tesuzeresurolo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a44048bac6---lijigemafuxagotekesawexe.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/wukitok.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sezabetulafoganulexowon.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73096586938.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g40679o1hsdt5dmi8r809tujk6/tiwozogawe.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fufifoxenoku.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb091f06---dizejijulama.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/78070030493.pdfIn PDF document text
    • https://heyratacademy.ir/file/wumozesawal.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xalunebowekawadikeg.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89442052271.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/valetokamowiveli.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/29023073235.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/febumezadaxotex.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613191aa7c3f9---73767497079.pdfIn PDF document text
    • http://wych123.com/upload/files/36881165052.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb621078c---jefajojawafekapusiroxasop.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/86185297102.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 19172 bytes
SHA-256: 49a8574dfb335c3c61f8b76f97ceb6a061509f458dbf1d9ea323d0889f646326
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 10824 bytes
SHA-256: 958937ace31a4635ab534915e82993a764cbaeabcabdaa19746ae63fedb72349
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1