Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdea5fa146e9bce…

MALICIOUS

PDF

76.7 KB Created: 2021-06-27 00:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ca3d28bfa079f685a22fe8a25becc41 SHA-1: d63621e6e6d859ab5030c72967802889f2a65b82 SHA-256: abdea5fa146e9bceb0c5398cd619bda4d43990a555003e294f003200bc594380
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=this+is+one+time
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dfcf13e1---19864328416.pdf
    • http://learningkey.org/userfiles/kusaxibike.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9d69f2f51c806876cbb66f893533552f/zewifevipawi.pdf
    • http://hani-bee.com/userfiles/files/86043886118.pdf
    • https://twr1115.net/files/fckeditor/file/11319879482.pdf
    • http://infoegrafica.com/userfiles/files/xoturirakari.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b88211c38bb---satuketevuvuduboxitejos.pdf
    • http://sportgalaktik.sk/userfiles/file/vivafobogekepol.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a244be6a170---93786707237.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c6b643dbcbdde961e74dd13ad3e9097d/ririxirezifemida.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0tv2m15a7n3ejqvk6jd67fnui1/74161075518.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f70e88bfd---pogaju.pdf
    • http://nanoscopy.ru/uploads/files/44924047167.pdf
    • https://hpsoft.shop/upload/files/99694514341.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4affd917b73be24a99f253933b925e66/31123236332.pdf
    • https://harrisitalia.it/uploads/file/vanonazobepotif.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a25135e6681---59514587156.pdf
    • http://aelma.com/sites/default/userfiles/file/gemuzufigesejus.pdf
    • https://ibeguiristain.com/userfiles/files/gomufasemak.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2r34lhlknimk05fr2abrtcl8dq/4009018220.pdf
    • http://st-communications.com/ckfinder/userfiles/files/42830492227.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbe05e926---gurenukixikikopezudula.pdf
    • http://tunglamgarden.com/images/fck/file/gaxulijafumafixame.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8b.bin
76e088a5fcdf70f50cbae20f0a5808f1e3956d8dc9a9a0987855e675ba878435
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 16332 bytes
font_01_sfnt_off0000f644.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
font_02_sfnt_off00010e5b.bin
8c902cd4708c78fcf4ee99b5537e57aa0486797f9bdc4fd16f8a4ec9bfa2bf13
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 10028 bytes