Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8694fb5e50a4826…

MALICIOUS

PDF

96.9 KB Created: 2021-09-17 17:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c2e921f3139d24627901801655fb359 SHA-1: 8980a2778cfc964eff16289f0975d052581106bf SHA-256: f8694fb5e50a4826218b7704906ec057f2cf5076bd00d5809dc0e71bc7ce5bc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection to these external sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=the+giver+book+free+pdf PDF link annotation
    • http://myappartement.de/web/editor/files/sogenewiga.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/35117101009.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/53571672416.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae344bd702---19316231706.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/tetopesupotim.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/seludipogowoxituwe.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210909082115_vxfk5l.pdfIn PDF document text
    • http://skene.es/userfiles/file/8417360405.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lvao3tqv9m6b4fpo26hntd97su/xozimi.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/fubazigivegobogikixoluf.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/fubowiwuzarivig.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/tikugijonezoxuwuko.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nefuxitumodaxupurelenuzu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/13119749861.pdfIn PDF document text
    • http://btfa.tw/upload/files/fabujijewegobazerini.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vijufewujo.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/labew.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091018142684.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/88296508521.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cd6703617844e0a71bf6e0a51fd6e679/detutobujafuzojeg.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/1540360704.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45120836907.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_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 19148 bytes
SHA-256: 0be36c5e2df17c3cbc1517d415bbf0a724831b54bd87ae13552392e1705ebd18
font_01_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F35 10460 bytes
SHA-256: 01f631405709ede8f04ddacf07a8f401367b4ca5f8136461fa02c551c0b98bb6

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