Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8bf4002c49337c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 17:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 483f28151de6486760440487f4481dd5 SHA-1: bd49a94bf2158541e94da4e4907de9b1ffc6567e SHA-256: ff8bf4002c49337c04e9fd74bbbc1dbc409ed573d732d658667b9df3f86afc67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://gediklimakinahidrolik.com/resimler/files/nosudulika.pdf In PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/70351633928.pdfIn PDF document text
    • http://kco.su/userfiles/file/40691245394.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/tufodoniwijugonikili.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76810981268.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/99901510929.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20809daa9---libosujot.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/peribopotikitojara.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/zarazemogumodokikiki.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/20401704113.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/tavojuzitaf.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/vugofuweratalalutajufumix.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gubagapalejonotu.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/26514020044.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/90765209115.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/savudiwuladenasugulaj.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/ritawuligij.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b63fce7dcfc1575f8f2308a2fda2c74/68420294939.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/dedap.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/67664487573.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/mk3sk6tm69ot6btpbe5k649h8j/24674313943.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/70268779869.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/84052522497.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/38570250128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=trainer+zone+apkPDF 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_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 10048 bytes
SHA-256: ea813a5b0a3574aac3078cc767517d779f8b656bf854e60f83612714540b6e1b
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 18352 bytes
SHA-256: 057dcb5185f77c7a854ffe003d2cc5d19301955640779487c76138cfc5ba2852

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