Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c07310e47285a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 10:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d964032c1e9501f5034db3443dbd2a5 SHA-1: b94ae94a11c98252919eb7bffaf962c8ec630e13 SHA-256: 8c5c07310e47285af82a3d6a8093fd94857142490a327203518a550e1c377475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, forming a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=launcher+minecraft+apk
    • http://denis-lefebvre-services.com/fichiers/file/mebodafokegesutijenibe.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0846e6713---94816213565.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd89f6ae6b47db85f861f6d5d776018e/monijufane.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/58529085067.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab0e65ec4---85371467373.pdf
    • http://alisawedding.com/upload/users/files/xuwabujaxopopodusutewofoj.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/pesibasedexiromisobemuku.pdf
    • http://xinyuemu.net/assets/202109/files/20210911045324745048.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/97251908083.pdf
    • http://finance-bulldog.cz/UserFiles/File/fatoza.pdf
    • https://tezerwatch.com/file/upload/files/09-05-21-21-17-93.pdf
    • https://cupanghitam.com/contents/files/6195676876.pdf
    • http://dambi.pl/userfiles/file/sazepojonuwafiso.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_21_01_29_48_4855.pdf
    • http://itkaufmann.com/images/fckimages/file/bakilijusu.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdf
    • http://nct-vn.com/userfiles/file/kurujemewi.pdf
    • http://utuin.net/files/fckeditor/file/13549633331.pdf
    • http://purepassion.pl/userfiles/file/11530754948.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/88356455070.pdf
    • https://bcm.es/files/galeria/files/nakupawirajuxo.pdf
    • http://happyorderfood.com/uploads/files/bosipiliragibopi.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/97926794293.pdf
    • https://ezsprinting.com/userfiles/file/33874870971.pdf
    • http://zoldjogsi.hu/uploads/files/76074073916.pdf
    • http://geodavidepini.it/userfiles/files/34315971050.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c1.bin
6ad9931f3053e055530c4b0f4511774482b964e73c3bf283bed23332aebaf3e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 14416 bytes
font_01_sfnt_off0000d5d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 16792 bytes
font_02_sfnt_off0000edee.bin
301962b0d5da50f6ea4621cf742bf990746a3ffbb073e8e7aac50cd8a517db46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10560 bytes