Malicious PDF — malware analysis report

Static analysis result for SHA-256 5403645aa9b3b36e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d58f30ae534bafc1fd0c9e19e1940243 SHA-1: 9f42d1da9996a7f6fd9055b1638b486b00d3bf87 SHA-256: 5403645aa9b3b36ecae4bb7f627f8c982019090d7c24390baa1ae8b8c5354b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=bruchrechnung+aufgaben+und+l%C3%B6sungen+pdf PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5d89478c575278f4e617b37033595faf/xamukikesalajasa.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/58462995315.pdfIn PDF document text
    • https://777mto.info/contents/files/kadobozeruguzojit.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2f44b531---10042477848.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ec086981e---98375838352.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mabagakawopixaxaw.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/70941640572.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/12679748927.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf2e93d11---67666522432.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ecf5ca48e---wutilukaxazezupoxapokag.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/71522764969.pdfIn PDF document text
    • http://jaika.in/images/documents/files/46683664997.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/82627051093.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10f2ad592---fabat.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/805924dqv8ha2vv04o6tvqn8vg/zazatefavagejax.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/6844102172.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/312211962.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/85567741505.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/46964817359.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/85743208987.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3d4e7c53---31269887411.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f928fb025e---27487931816.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120abc7413a9---sevexojewa.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kawawerojawi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf8e983c9---wofeges.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e1994c555---veletebavekilamugixizob.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d0ab5aa2---balanikuku.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_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 11096 bytes
SHA-256: 3c2b26273b5212c6f6d35caa85d9e523c95db5a2b3fac7d8e05a8f88c5b31e02
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 19244 bytes
SHA-256: e43d1fd8bd9d33f3f45ebe9d8c5a71223fb9f25b7dc27b92c68733b6f8e39bdd

Open this report in the interactive analyzer, or submit your own file for analysis.