Malicious PDF — malware analysis report

Static analysis result for SHA-256 4698a4bb3d5c689e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 11:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 752eb9e21ba34cb9243141e0876fc7ee SHA-1: bd2977c5b71bfd5b9bec852575d6038144e4ecc2 SHA-256: 4698a4bb3d5c689ed5ffc21ef51cdb8dd173b191b0e22761fe6c6c2d7b12aea4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://espaciocultivarte.com/ckfinder/userfiles/files/jazolagugawopadi.pdf In PDF document text
    • https://korzo-galeria.hu/files/file/41732212242.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090714528f58---denuguzeposa.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/nolalowuzinegadi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/sakijovowutajaveluzerom.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xofaxomefelezagowopu.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/tajotanim.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gcrlmusog3ss0q7k68jdm28o5a/65237007338.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///35174818925.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/6132136213.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/76655217317.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/amn08msk4h7jpmu97rmtte3ak4/75912964172.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5767991cea331646da393854ee236e42/73943990222.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/28504277684.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0809750c2---jujokasab.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/74818998399.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/jc3gthed316hrlakik6dhvktd2/81021581420.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/51920693235.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f532a365---xavewolomepuxidaret.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/66615749774.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/900cfeda77801831f12f5ecf032c1b4b/39689968347.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61def886c6---4921776814.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/86220808642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sociology+upsc+question+paperPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18528 bytes
SHA-256: a6bc8c94ae65484a49850f7af2e72257a25a085257d2cc55c5a8507f210ba17a
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 10984 bytes
SHA-256: 421033d887abfbd6ebdf8ebeed3fc77b2a190afa614a954401b1e5e7f45755cc

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