Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce695bb359f91ce…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 06:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b07ad561e89c122ee1e7d34bb1e912b SHA-1: b87420005bcac772f4be648441fc86bdbb135024 SHA-256: 0ce695bb359f91cebf222a040fd0cb437f039680a91ee8a5a75035e71615ca89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and an ML classifier indicated maliciousness with high confidence. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to lead users to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://koryosushi.com/uploads/files/tazafomegawovikoga.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d30aaf49---napesatagi.pdf
    • http://www.sealjet.mn/pictures/files/pejutifusavojowokese.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/98764305629.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/83528137050.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1c2fed8a0f5838a1b52b0048ee8d0ce1/47374270063.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g5d9i6ksn6jjhn8nvtksbac750/xidebawopodosejimawo.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/v3u0grovb83rk6qgkd5aeplap7/tesakeboz.pdf
    • http://vce34.ru/attachments/file/defajekujipo.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/zinawar.pdf
    • http://dotacjedlaoze.pl/userfiles/file/93341266760.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b65abfa8e---zepifik.pdf
    • http://unitekinfostructures.com/userfiles/file/gabekukazixasagumom.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077126fb0b6d---33657406185.pdf
    • https://yar-net.ru/userfiles/file/jewizu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8038cf5e023b871f5e71f6fe8d497009/6625985482.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2536b1a3e---vejiwabezoziv.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778acae9a8d---88278643301.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/monoxexifuvanefur.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c66dc3vko719itl21143bnjl1p/45769043267.pdf
    • http://shinies.ru/img/lib/file/ponusib.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a340479b7---wasinelawe.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f3d6c56fc107e4d3f92c780056c2ac10/guxez.pdf
    • http://kolasinprevoz.rs/slike/files/43285838579.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250908cd23a---xepulinagejagedemig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=contoh+daftar+pustaka+dari+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_off0000fa25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
font_01_sfnt_off00011237.bin
42c723f97c7105a39105ec45ee4a79029c628d6c026daac5ad525c6aa7f85c77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 16820 bytes
font_02_sfnt_off00013e16.bin
d264fbb067d6b2ae166abd1ec360b4c78f2f33f3a78a7b756341ea3ff0a19667
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 10640 bytes