Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0660ec5c23957a7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 19:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9bc1a21bf8d6697867ae5ac8cf4ee51 SHA-1: 9ab9b24d3f75137e344c09553e1331ac240238a8 SHA-256: f0660ec5c23957a79f14d165635f1e14e7ab1fa302607def29f1439cc6e5c0bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d30541b154---vibenel.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d3adee85735f5c0a124704f06e122599/gojukexaz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa97928fb---widad.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210824204728.pdfIn PDF document text
    • http://langmypham.com/luutru/files/86868053891.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b1459685---nakuzenebinegufi.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/36906908227.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/betepoguxedap.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/28098224783.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59a41f12e---92777794228.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77c5143a8---sezikususapezukeweriv.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/mububofexi.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/mumozukinebajotutopapawi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bb4d0d6d---juzidinafegofo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/81td6611ibn68p0u891fdgbkq1/83577514950.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/24035754522.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201345308045.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6859acfbe4---kidubimafuligata.pdfIn PDF document text
    • http://goref.ru/files/file/dewazazosejusubo.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/jixobeloza.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kavivukibafufij.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/53148759494.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/52616016390.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b47b816544e244e0352e6726e90612d3/29216589952.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/74059841893.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/bubixunav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=noun+and+pronoun+exercise+pdfPDF 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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10648 bytes
SHA-256: 349c866e50987eea8722290e95cf9e5ad3b4e53e21585fb2ecd4a691956123d0
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 17052 bytes
SHA-256: f1afe85a081549a24ca984b8c938db35b4228171f9ce43009de42483a0181394

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