Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26d892144cdc815…

MALICIOUS

PDF

94.1 KB Created: 2021-07-22 00:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f74f947b298ae4bb2a8eacec06eb339 SHA-1: 1d60db64abafb028600124bceb92b2045fc20964 SHA-256: f26d892144cdc8156c624233b0cc7ba4f06588f77f3a4ce2e710775baed0e128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://suprizpin.com/calisma2/files/uploads/dowipebekamoda.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/dve6t74t2oh75e2vm0vom724r7/92808877279.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/48288921319.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30acea157---dugukivupifetaruzubaji.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076626c40029---xegumozuwevutorunodixonon.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607666078dc78---tobimibetabimuz.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/198aa2cc7cc2fc14831cf7309b8050a5/7597874252.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/jodirivida.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/99964647616.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b222f901e82---75497412269.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/47888738638.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/tofazajemakazejidadowi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xiwozasifunomizatepokaj.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/808aa2af1c589a5d196ddb006d3c7282/bibawisudinezubenilalak.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9f865d261a0629d9baee291b889eb40d/newilibovufedivaj.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/24997323609.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b257406ef17---49048688873.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/73027658131.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/rudedudilivobor.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/liwaduleje.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/38a3ccf403012a67f397623c84f5f5f8/fararafazagikuvikikumim.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a81680a17f9---23939721383.pdfIn PDF document text
    • http://short-story.ru/upload/file/gekob.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f8fc4cc5---89390884799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brand+blanshard+the+nature+of+thought+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_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 16324 bytes
SHA-256: e729dcc45978690195179c88afe1026f90e4f20932d3ba455560f49fb29f9338
font_01_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15068 10980 bytes
SHA-256: d44632163bb0961fa7121b562d924171ba51c6c8a833cfd052212faa8ca46a12

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