Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd084ab9aec176f8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 11:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d7b709caf271c48cfcef6c79c6a4c8f SHA-1: c891a645dba843930fa09c8a2f487992a213dc80 SHA-256: cd084ab9aec176f83c9f320a1f48c8cc6c94fd43e7f2ab0f898d91d4a18cf3d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the presence of PDF link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4676

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=excel+app+download+for+pc+free PDF link annotation
    • https://carrieres-pierre.com/userfiles/file/tefevafuwi.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/nerawa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b306b7dd9beb8878ced329d3feb041b8/94159724069.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/76355239546.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/42296271559.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/63995667243.pdfIn PDF document text
    • http://dongphat.net/upload/files/92623164462.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/64635768767.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/17197187463.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9bba15873360c0a822dfcc5cfca44b42/61155289610.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/73348822740.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/774269370.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8f6675f3921c7056278fecd5f4af83e7/rotinozuni.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/sukodukumof.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/78812411519.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901075125499531.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/58447474728.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/453109515.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/juwepozexogoxav.pdfIn PDF document text
    • http://ukrfirework.com/images/file/61866364406.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/wugixifisokedat.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6006e8bf---55076563019.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/xedavaxobikizumavamo.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nufozitisusakepepujo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/98515150462.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 17792 bytes
SHA-256: f209dbc526ba8bab78bee0678ff78537433ea4ac3cccb46269e1579687b8673d
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 10424 bytes
SHA-256: d468ca6eb3ea071fb8432b643a399366009b42e7ae7ef602a5dc3cd38124df26