Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dbd1c2357abe2f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 11:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7adb460a0760ba5801b20edc718dbd97 SHA-1: 8d5e67885f3e5c25de28905000fb97d8476c51ca SHA-256: 26dbd1c2357abe2fd91156f53ebc4cc4c3eac4b1c13577e385ec5e522c4b0d18
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a secondary payload. Multiple external URLs were found, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall pattern points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ketchas.ru/uplcv?utm_term=micro+sd+card+not+detected+android PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6857613e13ceaaa21e6fbe60293ebc7d/35947694243.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/6024183568.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380d1d63ede---54462469860.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/xotoninatolomule.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210908191307_1240344317.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0888329a0d947b4d96205ef24f5eb308/sikam.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/gulugevu.pdfIn PDF document text
    • https://arendic.cl/files/lofewilujalomoto.pdfIn PDF document text
    • http://sbkf.org/files/files/44519704383.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/vexomam.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/58a790bbf058da85a9a2d4e9f0da2f1d/xalujigizexi.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/jugozujisejila.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kedonazuletirosafo.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tasativevegomowa.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905183324.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/jumosiwivo.pdfIn PDF document text
    • http://kite-surf.sk/files/nirujelamarovagifemisepu.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/3025778266133fc08e6347.pdfIn PDF document text
    • https://olterus.net/contents/files/xepexurade.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/49812803958.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/7166993080.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/65842571778.pdfIn PDF document text
    • http://hueide.com/upload/files/biwugugiluzaji.pdfIn PDF document text
    • 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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 19324 bytes
SHA-256: 7a4a839e3ae7077ed03ef0cb6dfdd1f73303bb1f2c16ccdd07c114122d9c0dcb
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10308 bytes
SHA-256: 93828306a21a723503a13255c9b34745256489057af46c940213c567ab8ef007
font_02_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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