Malicious PDF — malware analysis report

Static analysis result for SHA-256 f944a6ef9a6cb93c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5662131a16f9a8e29dbe46baf3f0b7e SHA-1: de39ca5fd28f4f181c3a4eb9004c3a4ae46f22b7 SHA-256: f944a6ef9a6cb93ca399b8cb9c0340b373d2f2addff8bbd55284dcbf43a0f98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=functional+foods+examples+pdf PDF link annotation
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/946de2548c5787ac628e94de7eac6519/dazagik.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/popasiledulumanuriras.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608392b7f1774---76771814552.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e8la319ke6d4qfucu2nvu4vbs4/muxatadu.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/xitagepewivobiwidibufeji.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612700fca4a7b---87896697674.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/kikozovegi.pdfIn PDF document text
    • http://tcihk.com/userfiles/wubejigoz.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wokume.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p2pgbddhgod63on8g02to53791/vivorutetagukivetoguki.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/37951070806.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e55b476f3---gaxiz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/92677556486.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/79462821253.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lerar.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/89238647793.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331c9b74e5---16041007320.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/da721a0459db5685200dc7c3e2580404/rumudak.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/navilufuf.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/82614773038.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/sadotusuzulipibuseti.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ef55a36de6e37b0ce366d0fcadbb42d4/dukowibuwujiwumiw.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/supibitozorovutimiw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c744873b199---61686874016.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_off0000c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 10860 bytes
SHA-256: 5c538b466f10d490d5a1b835f7ff06d93d525fc085651d0751e7264626853bbb
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16464 bytes
SHA-256: cf63898c47692a63eda11c265e9525dd672cb2a5733d0d1f7b5745e114e2bdde
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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