Malicious PDF — malware analysis report

Static analysis result for SHA-256 92751f27908f4e58…

MALICIOUS

PDF

86.6 KB Created: 2021-08-22 02:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70c0e1532e04b543a0254f8336f97635 SHA-1: 40ad6e2279933aa165952e66a24f75cf9430c47b SHA-256: 92751f27908f4e5802e2f20125d614093f347eea2423058bd12f5a96273de20c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://topspeed4wd.com/ckfinder/userfiles/files/49135592862.pdf
    • http://leebyunghun.kr/new/upload/board/files/90701840888.pdf
    • http://ajivikafinance.com/userfiles/file/14501515780.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/juganedoguxu.pdf
    • http://1careglobal.com/upload/files/39049299783.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17188c5e3---jiginelafujakogepoza.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41477c199---nexanalitexaduzagojaf.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d75c0b2000684302c16dcb26708ef625/devuxezuno.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6c821a96---bebefibulivozum.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/98041239167.pdf
    • http://fjsxsx558.com/upload/files/15921634158.pdf
    • https://hoalavender.net/upload/files/zuvejib.pdf
    • http://reklama-kemerovo.ru/files/files/36921712647.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8737a841---josugagewexedebositomib.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b11ecb050---bisazejopizujabami.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72978edf7---85321211688.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098248c8424f---gopexefokoziba.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d62eb93f2---worimazunoriferomofexur.pdf
    • https://accuratesearch.com/userfiles/file/95921926171.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844399bd55---madibemod.pdf
    • http://artgraf24.pl/userfiles/file/43436208415.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/40474689998.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c6a02b3a488927d807ac91fe38bb9ce1/xezizozuzuzopi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tsb49lrhn6bo62q7duf2na5c7c/62230630533.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ankara+oyun+havalar%C4%B1+mp3+indir+2015
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16792 bytes
font_01_sfnt_off0000eb75.bin
93e0b3ccd760f607765b832f4e72be035905aca6e82b9987994fc8930104ab2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 19124 bytes
font_02_sfnt_off00011a60.bin
9d07f0763bdafba8c8961ce132087e95eabf0b761bccb35b6d0f0da5219c0f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 11256 bytes
font_03_sfnt_off0001348d.bin
91578b4675e327b6268a3a4d916c53ec1b5ea4063acbb15d62a2d82c951174e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 16112 bytes