Malicious PDF — malware analysis report

Static analysis result for SHA-256 387d359c7ec1b2ce…

MALICIOUS

PDF

87.0 KB Created: 2021-07-14 09:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59891fd41bd66ee47f64a1a13ab7d0ea SHA-1: 3d2f4ec0f18ba0a14c8dbcdd25e204d8febfeb14 SHA-256: 387d359c7ec1b2ce9f8edc7769497f2cc1d4d3c58baeff9d7ea54cea00840d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebb977526---24837701024.pdf
    • http://alhouti.com/userfiles/file/tafaferadabe.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b1b738eda19c65922d621a6965d06f69/jawuwifuvaziviviza.pdf
    • https://aedwea.com/upload/foto/defozugofofapirajebegat.pdf
    • https://anmoul.com/userfiles/file/sujalafeweseluritedo.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/vebapoxaju.pdf
    • http://learningkey.org/userfiles/7689880081.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b291e79fec4---65165769228.pdf
    • http://modamoda.nl/uploads/pic_lib/file/22386466596.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8195093429---jalevonofugogofulobizo.pdf
    • http://cmrivestimenti.com/userfiles/files/zosunefetaborolijuxexu.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/96233be9067e7be5ef9fd4e51ba36c82/fogawuzimefaxoso.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132b43749e---revojozubisus.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c41a3501f3ee87ade2ad18d761868aad/7628198143.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58d39ce05---tujiwo.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/10143370976.pdf
    • http://agendaalzheimer.org/files/galeria/files/39684991600.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/701695ddc0303edec93a94832479b05f/29253937556.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5bsourfumnu4v139lisqu73b65/fijuvegubilenisa.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/11124176105.pdf
    • http://asokmontridental.com/userfiles/file/12733696548.pdf
    • https://beatmuellerfoto.ch/userfiles/files/xixedukinole.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7114d7f4bb---roxakoganaratuparonudejuf.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b34db8118c4---63181616673.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=brown+point+siamese
    • 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_off0000f2f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
font_01_sfnt_off00010b0e.bin
1c01dfa48495cadf7c94257f9b71825473b7fe03cac312fa60544a95827e71a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10508 bytes
font_02_sfnt_off0001230c.bin
f652bdef670f4452f9594c2b22ddafc72e30867e9fdc4a776ac4ed23c83b017a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16820 bytes