Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ffc0f1ee26cff6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 04:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 42ee36a9d7d01e9f9e07da6381d5ad71 SHA-1: 6ce7772e70636647b36ba75d67100b76f7af831c SHA-256: 72ffc0f1ee26cff65d2336201a150d024ba500c4c45bf845fb8afa3836226bab
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to potentially compromised websites, suggesting an attempt to deliver a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://odpadykj.cz/UserFiles/File/29595806639.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d40038defa95640507d5acda5957cd3/37219906980.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ve79jv42i4m4lqmgjuerd1lm4l/48537917108.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/72297955231.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/44873530893.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/rakuvej.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xulatalafuxizuliwutel.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/siganavijabipebonekak.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3748f13fbdf1df692ab7ff9c429bdd44/42010969170.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/27739830701.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/4362258735.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e63b100ea---53513630059.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/vuzip.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/2909887236.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/85536992204.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/lefamikajugifudoriberog.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109051846188276.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141969256f51---43457622509.pdfIn PDF document text
    • http://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/52135159293.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/10074650463.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/geduwarakexuxodopirimuxi.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/xivusif.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/53731a426a732b79cb99f77ef5ef61fe/riwaxerusewitawipodod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+light+platinum+rom+cheatsPDF 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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 11012 bytes
SHA-256: 17a057b9a790c4b49f2e85aa2b49555f37ff7a55809113ff022b93b0cef7d3f7
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 18272 bytes
SHA-256: c3e245bbeaac4e2eea89447ab3a8aae6e6a4dbbc036f18b5d4b88e8c005c93a6

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