Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0a91721edd10de…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 02:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e5016f9749d04b239d668993a82283e SHA-1: e23eb9a67e2552a3a8618d9e2e947c8daa263c5c SHA-256: bc0a91721edd10defbbaf5868b792efa4bdb26abf2fe7ffa005358b9bf0d0867
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=missing+you+robyn PDF link annotation
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798375197e4---sopezolef.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/a154ksq4numkgddf33olvaujgu/mivamutanafileb.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/89438145178.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7vk4ta71hi8s6i2m5v1kg76i14/mazuwifewagiwibivaxoj.pdfIn PDF document text
    • http://th-hl.com///upload/files/rupojijosefidi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160775dfbe2f89---defozunovatesamejokum.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e532d838c5f---muxisugutupaz.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wesafazafedexoja.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/69h968osf5eetvrjuf27lr0vi9/kebazexixusisufimegosu.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/kirivesidipetibivelobobo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/xofoma.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073069e28aca---jubazajama.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l1d7pj9vptp2rjiqra7sd00nk7/36213156589.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kumemebakekasovepejad.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/87208756369.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zesofilifomidewezifenujib.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092ac8114e---tixiju.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/towagoxipiwojokitufujuxam.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/55658708368.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/21148047038.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/goweninexarelugire.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/25667972522.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 17020 bytes
SHA-256: ce2e8ce73cd4977f5377a350ca890ced29894c9689c53236fd847b829be653ae
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 19608 bytes
SHA-256: 06f3249acf71bcffa6b3a0f41d35b7e2eb751cc43fdf48e4e4a8938a696746f4
font_03_sfnt_off00014d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D97 10192 bytes
SHA-256: d6b1e828c549e5bef811108d800652a75574f10c622bb3977b781c53de4be62c

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