Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3fc84633ac55e5…

MALICIOUS

PDF

72.0 KB Created: 2021-07-30 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bdce20534890fec9080ae43d1bcd065 SHA-1: 853c56b2ac9bf19bd7c4b974859c9369e978918f SHA-256: 2e3fc84633ac55e5700562a4223244c29d6e12fad5b5cfc6d6e44653aede4c3d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The file's structure and URL patterns are consistent with common tactics used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2862

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://smidgel.ru/uplcv?utm_term=compound+sentences+exercises+3rd+grade PDF link annotation
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/bf6df6b342a0c733b3163e064984c932/63571184737.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/25247705103.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/monalamadiritor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d11b50b3---japimitepe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/253bd3a054004620d8dbd7725581d87e/kimafepoleburivuvur.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/12775038157.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/gezudav.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/cdde9d54ee04c471e8c665379b4f2779/18449009655.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0856a2dd6---dexexesasididifozatusa.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/9crntr3c3vbgd94j67tmsm2sg4/38114354024.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/up0g3lmo90vf886f7oi9drth74/venaludifa.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/3661879338.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c67e66938---megivoj.pdfIn PDF document text
    • http://ipublicity.cz/data/file/39387565155.pdfIn PDF document text
    • http://huefpdf.org/upload/file/37032065101.pdfIn PDF document text
    • http://zenithmetals.com/files/94542251257.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16da1c5d8e6d5081f2bcb57af6a95b15/69166778896.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/olc1ujmlban98ev96kgjudd102/40933872541.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/12274433220.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/3572249674.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6c0b1b6ec8fe18d247e4674444fa08ba/82648187863.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1f39f76e7709fe6112f9bca2ca29803/lumidir.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/75954327283.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d64266a4---vowuredaboxapopibati.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/66068493664.pdfIn 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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 11216 bytes
SHA-256: 4dd5e1c4db6c751cc64fd524842fb6a0d2a3beca6088613ba8163a0baa20b473
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 15868 bytes
SHA-256: 5eac10d99fbf44cb014b60ee7327df514ec8c78ede755473806c145d745d9bc5

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