Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec454a78dbac60f8…

MALICIOUS

PDF

94.9 KB Created: 2021-09-23 19:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4264f8f8a6f701e56d59519314818e1 SHA-1: 4f108f167c06ea206a82f12e193d89c70990ad1a SHA-256: ec454a78dbac60f88088c4953c89896210a0927206148f08b5f53f00c0257fb1
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates these links are on disposable hosting and use UTM parameters, suggesting an attempt to manipulate search engine results or lure users. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=app+telecommande+universelle+android PDF link annotation
    • http://muacuoi.vn/Pictures/files/bakuzolav.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/34363585205.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/74533719276.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dcf84cefa5469f40649a30d336226991/sovaxobowifinesun.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/70193710815.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/78752063461.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/82764588443.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/geviwu.pdfIn PDF document text
    • http://hoachattn.com/image/files/18408905464.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/83c30adae175f92f2d5992e2f3f44363/26908352015.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bovolubebafe.pdfIn PDF document text
    • http://orlickachata.cz/files/files/71301454907.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/77045628638.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5b5fb1bn9gk00e0pudpb61jfv0/36429952793.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/60201727855.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/5902323805.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/80851368847.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e37d73a82---sutopugudotukurijidiw.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/vopudesitamunex.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/xowanasidatokeximapaju.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccbdb24c0---27284580426.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908015452.pdfIn PDF document text
    • http://medrea.ru/upload/files/mipiweba.pdfIn PDF document text
    • https://maria-galland.ru/files/file/xejuzadasiruda.pdfIn PDF document text
    • http://namngonviet.com/user-/files/funabuzaxotesakizixavukas.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_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18996 bytes
SHA-256: ddf956b584965c5deb7f7449e14450ff5c9a71482eb93894a963faabf0d7469d
font_01_sfnt_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 10824 bytes
SHA-256: 71dd6c18716f8f35694087dcef525acb66a3b8838dbcd19a304361317641902a
font_02_sfnt_off0001555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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