Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07cc6f89786a807…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 19:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5434acaf09696009df999a2f2a700b0d SHA-1: 93ec085403d1f48f3bf1165872f7604893d308e2 SHA-256: b07cc6f89786a807126e9ac882040cb90f7a16e1d61944945791ee3510de0508
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm or hosted on compromised CMS uploads. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=honeycam+mod+apk+free+download PDF link annotation
    • http://harissarantis.com/userfiles/files/vuduse.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090712510373499.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/wimopa.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210907184825_2078198845.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/ruvud.pdfIn PDF document text
    • http://hk-keber.de/images/file/badutazomo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/vorejonavom.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/milomadaripuwezowade.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/64a7ffe28bb653c734ceca79a0b47e9b/piwigufugadotej.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/75009547941.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/47473506414.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5hg2psfsj80pc6nqjlddg69taa/zemoluwodozolifirepejare.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/sujorivizojekuwa.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/82281866372.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/94219148212.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bijiko.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116243ac6e---72951934151.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/vopoxojutuk.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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 19396 bytes
SHA-256: 667e88e7250727c7a4bc68eae61a6dbdf42a7fef50745a54779de9a0f0be679c
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 10704 bytes
SHA-256: b2cd97eb52e70cf5aee7ae6d705e86c3ad1fe2616d75b235a92d1521e9b9d53e
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1