Malicious PDF — malware analysis report

Static analysis result for SHA-256 85904aaa8b3fb3c3…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 22:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 473fee5ea117495ae2e003fe6298970f SHA-1: eab3e1cd433d43214fa28c06ca7298ff50a36c50 SHA-256: 85904aaa8b3fb3c3b8190da5fa450aa5c130bac2863a44d254aa20fdc593ea2b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/co1ohq29ut1ua2lvk3h3fk2bfi/27468205037.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b76aaf8659b---luvofiwelojafoni.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rjv9tqfqejvmjnm90fa3bko4n0/rewuturesipisu.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/50273903925.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d27bc075---dibaramuzovojofexofawa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981f606775---febudewirebalosulubakup.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c33o2upis14ogg6raq1u2eeees/99609587378.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/rajotarupojimananud.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de44db8e75---kivugivarupijuxukefugudu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/u55th14ciknge02kfraguhod47/39929931110.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gatesuduroma.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/24328223769.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/34310764267.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54220096283.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/63c4eb6c4ba4f60ef130da629b36c8b1/gesukaleridajasegebis.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/fbd6582b9736b79e619fd42d50b2316c/mipetawitolikagulivix.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b766e82aed9316a36e21071c9d528321/sapadi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f04735f74---5042964336.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/adca41d0ceda86b4a353db3bfb0d9524/12353457469.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53103cc150---95484637917.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wototofunogenerame.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d90b7e21569---daxivivu.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zuvovuforibeziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=3d+user+interfaces+theory+and+practice+2nd+edition+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 11080 bytes
SHA-256: 832232b442e4d569fe81463d9e526667d02a0f5278a8051bb6449e19473b8b11
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 19676 bytes
SHA-256: 249efc6d2b3b8088c33362f3e20a0895cb29ef0498aea164e43945e81ddca7b8
font_02_sfnt_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15380 1912 bytes
SHA-256: 9a3a58d059f0498765509154412e6c3ca0071ae5de5a9d50406dc1ac3ad283cd

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