Malicious PDF — malware analysis report

Static analysis result for SHA-256 84707110e1c0fcba…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 09:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3f284f7f3acf6e551cbecac0e9c42fc SHA-1: 0e8b3a60061ae21862abec76ceb848af3a5529dd SHA-256: 84707110e1c0fcbae4ffb2b3677765bc7915ca269f7806fa37a6e15742e84e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier flagged it with high confidence. Several heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ra7a7p-h3ba7.com/contents/files/79740637417.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/22811379810.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/97901362812.pdf
    • http://fernandopelosini.it/userfiles/files/jovar.pdf
    • https://gadesign52.com/uploads/files/202109161755067781.pdf
    • https://luckysurface.itweald.com/uploads/files/613291e5e162b.pdf
    • https://showdetango.com/bafa/userfiles/file/41043671188.pdf
    • http://willbramephotography.com/desimakodetilorururoj.pdf
    • https://pinyardim.com/calisma2/files/uploads/zimaw.pdf
    • https://glearningsolutions.com/userfiles/files/tosiforigij.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/33886929378.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffee48e357---18829489830.pdf
    • http://sloplast.com/userfiles/files/73691031582.pdf
    • http://naplesredeals.com/userfiles/files/vuzemupobaj.pdf
    • http://gayaarchi.com/userfiles/file/20210904070525.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbtud5b694qudpg787j4lsoqh0/romazenozivinogigalisis.pdf
    • https://parc-hotel.info/file/81938509418.pdf
    • http://nb-magnet.com/upload/files/vimefosizotuvad.pdf
    • http://hoadon-dientu.net/images/files/xojeto.pdf
    • http://ttccid.com/userfiles/file/jikowazidif.pdf
    • http://architettotamborra.eu/userfiles/files/doxodasad.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vd9j10h2qfgbdvl4fjdle66kc0/15753428641.pdf
    • https://megalightgroup.lv/uploads/files/bakotazikewewofogevixemo.pdf
    • http://esrafisek.com/images_upload/files/26779174620.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75321746450.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=thesis+methodology+example+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9e.bin
e296d9129768803cf78451f8b7bc45efa8dde43e974aface6be1902ca1d9db0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10920 bytes
font_01_sfnt_off0000e8c7.bin
77b1988a241d05a6db5d3e85fc88439b7c5a0c6d117bc4d9379501346a5e09b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 17564 bytes
font_02_sfnt_off00011677.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes