Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0bfa71a777f9f5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c175fb8123e2d31d08d6f269675ea19 SHA-1: 286f6f73d7d29adb36c1453a0af86069956af334 SHA-256: 4a0bfa71a777f9f500ba317935dbaf236cd28ef3627acc48652de0fa1f481c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to links hosted on compromised WordPress sites. The presence of these link farms strongly suggests an attempt to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.nachtruhe.info/up/files/xulosumaxogev.pdf In PDF document text
    • http://locnuocvietmy.com/Images_upload/files/72631610864.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nupokezosaneboxawi.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/nibodi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kuxebumuverejepobibet.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tufem.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/titomekemubotateroge.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fd547d5a---ketezuwizerasuwawa.pdfIn PDF document text
    • https://turbooto.vn/upload/files/vogujenokojokuw.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/73067500937.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/83247703975.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/65487153028.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/duludakasobumos.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613032a943d29---nurepajafokenofur.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/99676278812.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/jateratewadabazuzapex.pdfIn PDF document text
    • http://norservis.info/files/files/28194256133.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133701d4ce21---10732563948.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1802cddc---23025625011.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/xaxiwumexapitivelavajake.pdfIn PDF document text
    • https://proia.bg/userfiles/file/guwojozusotizagetafufuxe.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/98897449770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=samsung+galaxy+series+price+list+in+pakistanPDF 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_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 17080 bytes
SHA-256: 1bb1b45688e1792d086f3e562db09345a9cbdb0c5a463736611806a393953820
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 11080 bytes
SHA-256: f489ece68223f2f089452c073a8d1a800db0be18ef2249cab8aabbc85813c652

Open this report in the interactive analyzer, or submit your own file for analysis.