Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe46e9d6469ec79…

MALICIOUS

PDF

89.4 KB Created: 2021-07-29 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dc47c12338d5217c22a5784eb3966984 SHA-1: 7803c3ca07888c720ec8c8a77904900fd21d3324 SHA-256: 7fe46e9d6469ec79889306471fb92d5a9ed41f5b0e7c17c240eed56d544e420d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, indicating a tactic to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://jtour.vn/userfiles/file/49269463612.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/manofu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/49016979717.pdfIn PDF document text
    • http://laduses.nl/image/file/ragefige.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607617fd062db---monajanur.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094364729075---87316733487.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec922c67d---tufasobugilojugifepexegon.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8e881e1c3fcb6464b8681adb04133e2f/5009717072.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/96346064384.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l4i92r2bd6dak79kf4ag3u7032/zuvuv.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/55557503640.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vawozotaxujudisog.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/49182093550.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/81882857847.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/badidipunoguruxajevalegeg.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/85121742261.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/38060011040.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/jotomotaxemodija.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/34766218935.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/69513805366.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658c25322c---93189129472.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1badde7b05---21044387171.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c161fe5---matefupuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+take+apart+nordictrack+ellipticalPDF 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_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 10508 bytes
SHA-256: fc1eed57ce5d18c971077c350ea50c2b1e6bd746eb9ac0fe22f519f31e9f9b85
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 16960 bytes
SHA-256: c2c4cb37cf9dbb6b8014cd2a6a879d9e453b44aed1974be9a7f3958a56d226fb
font_02_sfnt_off00013cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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