Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb03cd5665701841…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 09:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2712ce1680dad81be90fa5a2ee24da9b SHA-1: 5bcdf75791406019e9bbca39fbd9aa130711bb83 SHA-256: bb03cd566570184195094ff96bace9bd38a27fda14f6ff7928622669234dab90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=quicker+math+m+tyra+pdf PDF link annotation
    • http://strandedtattoo.net/file/wariponojavubor.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/88126700596.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4cb4a0a887363f7377e683e42e87e790/belomibe.pdfIn PDF document text
    • http://whatdwellswithin.com/file/87664551308.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a685f8d452a---kobamurowowuzepixixip.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/7682125.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/60f8625cf61894d6ae999e826ca94e83/15813185548.pdfIn PDF document text
    • http://quaint-house.com/11457220554.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/632783105.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/14807323556.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f42bda9d4a04660383aef673cbdc9912/sitetisunisavigeg.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3aceef866db8aefa9a4415139f5ac5b6/zukerorikuwegizef.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/30758527196.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/j4a4ino02sod9bf7v47ibgf5q2/tubugonuda.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cc0968f4---47893761126.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a81182e472e---57757141180.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/tubopav.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a0313b87---5842222632.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/likodilopufa.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/26/bepazivanizomoxotezukatu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088a03ce6a1f---14754820766.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/66283663220.pdfIn PDF document text
    • http://theponghop.com/upload/files/wipigurarafesod.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 19268 bytes
SHA-256: 281b2e46c28e3c6fd0eedcc58cf99e427bdf8639b895e4b769c5af351276a650
font_01_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 10812 bytes
SHA-256: e1a9e8dcf4eb0ac0617eeafe3c9c58c0de9e110326a4d253824bf2f6b4a782ca

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