Malicious PDF — malware analysis report

Static analysis result for SHA-256 657bffbb770c8929…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 22:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6917ace4f0566b12ab5e462c08fde017 SHA-1: 760ab0146e57354d32622bd6ade9be2e2ef88878 SHA-256: 657bffbb770c8929576f28e0d74fe37f7bb224db27b6c013288090a45e2df3c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to drive traffic to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/570521e55eea0613a6361ca27a7f6547/56767130809.pdf In PDF document text
    • http://falerisztika.hu/tmp/pebofolazalitijuge.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/63309777434.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/dunafutesapekoji.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/81557812969.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a721f6256d---xiduzejowetupisi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/93633084650.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/kikatitisotadesafozezo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c70abef23---jafatot.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e12227c9ca---98752742745.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/01146bc9428a30bb28b3c5d1a9ffc3cc/nifawulewetemifi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/75088687022.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/tuxipisok.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8f14c82---jasaxo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/tatesifiwetezor.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9310988fee---34428796623.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087189c17766---kulitu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bns9g17qqe88m2ploaf283ridh/mosiwefelew.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/57785509090.pdfIn PDF document text
    • http://ausafe.net/images/art/files/joxanojivaxodobofadoku.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/ledexuk.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/84113058675.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5ah8e447ivspsjj0gvtq7o94uo/48466422308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=percent+yield+worksheet+high+schoolPDF 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_off0000c420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 16968 bytes
SHA-256: ca38cb560b0d120c06a8b491222f6cee22b71122e9b1877f3e18490f41afab18
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 10780 bytes
SHA-256: 8b233b2d1b76ec30af0f8ddf02c975840d469e98ee1622209e4c8ca1e79f6a5f
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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