Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fc64ce9ed9a0e5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 14:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd6a69901fa1bbd1043967872db0726a SHA-1: 408e6a28af433c5e47baa3e65416c6aa54699dfe SHA-256: c9fc64ce9ed9a0e508d5847c159742a800881c6c1e2e406a1af7375a60973ba0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by an ML classifier and contains numerous links, many pointing to compromised CMS uploads and disposable hosting. The document appears to function as a link farm, likely intended to redirect users to malicious sites or download further malware. The presence of multiple external URIs and compromised upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=best+video+call+app+for+android+to+ipad PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e178a9036---87081229648.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/sunafonotuve.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99d896a1c---velijopadojalunut.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d5156445---buxefutiwek.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec86172ef---vigexumojaro.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517ec43496e---30249616576.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/17964547174.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/64607379501.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/17713395048.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/67735698455.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/kaxevumebofazujupajaz.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/jufezevezenim.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/riruzamuzadusemexezire.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/rovovimarira.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/kesazafelerapujiz.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/xerowa.pdfIn PDF document text
    • http://rapet.hu/files/jidaz.pdfIn PDF document text
    • https://mklaassen.nl/images/file/40115656370.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613665314be24---7537169142.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/nadediwixakipusok.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/23243257158.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/24452439268.pdfIn PDF document text
    • http://iphysiology.ru/upload/xagilizowijo.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/dibokarirusal.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_off0000b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 10732 bytes
SHA-256: ba406817aefccb2d42389fbfc1584aeb747a4fd05798c2b577e0a0294324f455
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 14844 bytes
SHA-256: 64a8570cbbbd1d22044fa666d007690b1722b52377df9637ac4aec75fc8d1b98
font_02_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1