Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c5d2b92bdb5bde…

MALICIOUS

PDF

99.1 KB Created: 2021-07-13 23:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b26a4d9f4aab462ca43a5ab0a3729bc0 SHA-1: b203882d157e19c6c125172f88107b1836914323 SHA-256: c1c5d2b92bdb5bdec7c88ae4fdb4af1c3dfe56d8c82407aa5b7c095b15ce0d7e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cost+accounting+problems+with+solutions PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa55e1106---93554361934.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/339og5tganloc9gkqv2mpn0di6/85710357430.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b0f1382a---17870873463.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4b8f6e44685cf4411425b541e6219b75/vodukujofig.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nekasesevive.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/32169652987.pdfIn PDF document text
    • https://baptistfriends.org/media/bemip.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/32342729824.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mazawejizeterejenuki.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dead95cd7---xexizakizonadi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6043cf9a6---puluxajonedexiwe.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b288b243---bupekasi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/13708678850.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/22633c454cd229162113fe1f0d7ec824/xijukegejafilalatilufuvam.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/xipijoxoxivofi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fee24778---18925079857.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b6419e0d---pebafolefunigulivoresalun.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7219659f0---6355449303.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kowonuza.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bbfc8554cb93702e627397ec67d74552/zutelebabiro.pdfIn PDF document text
    • https://sy-tech.eu/file/nejevasexibajidenavo.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fejukunafovavovovilaxeb.pdfIn PDF document text
    • http://garderoba.sk/images/_file/3351284594.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/22496993504.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_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 17624 bytes
SHA-256: ff0d042a2ce9c428e2746f9cb8c30c8533d42769df94812760bcdee2c507846e
font_01_sfnt_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DD 11180 bytes
SHA-256: 6ef94c2299f91cf663ed8681218b30409f96e05e1067a576d56983316e68402e

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