Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffc692d23628769…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acc52da7b3710faaccc51a3df0d3e6e1 SHA-1: 0284edb5ebf64268fd4570385b1c30788988c9c7 SHA-256: dffc692d23628769a71e733ae99d428ca226910f91411bcb005644074780d99b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a link farm designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=how+to+open+pattern+lock+in+tamil PDF link annotation
    • http://kpdb.org/userfiles/files/gorepapi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/megiremalinerewiriwumez.pdfIn PDF document text
    • https://kham.vn/userfiles/file/18278348779.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/12125507409.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fopojixudadetezuxideju.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/26714507007.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/20757726506.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13589126937.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/35920856171.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/13274142409.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d266aacc---49102187232.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/ximokesikerad.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210917_174710.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/pazepejebejuvigusesupiduf.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pujunub.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/jodegaxo.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/88818986925.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/lidogalunamel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e570c4410f---bajovokatipig.pdfIn PDF document text
    • http://beta-rc.com/upload/files/rowirevotosejo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lifomurije.pdfIn PDF document text
    • http://newworldss.com/uploads/file/54685442201.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/dejexepufixosejekovaxos.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/11001173532.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/58373975972.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161447299d9c6b---84467718702.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16912 bytes
SHA-256: 34fcffe24c3883f8e967caaeb3f901d6fe9b01ebd6b350204c533031e3625396
font_02_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10536 bytes
SHA-256: 4364f07a383caec04389e36afb83c5c48af8344e6e37ed7f9335f3c181561c25

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