Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a1e6b41b42fbc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 12:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfa32e568f416f0111a3dad3519027f9 SHA-1: 667ace59871336a296a4329e0c75b35953730773 SHA-256: 5d9a1e6b41b42fbcb2e0d9e31906504abf0eb5bc10dace0b5d3e0d1bceff9d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=regular+verbs+pronunciation+t-d-id+pdf PDF link annotation
    • http://frigotechreina.com/userfiles/files/91657588877.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e6eca6f5---30823023325.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ae5df3a0---posunogonaf.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210825045032.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/nefasirewe.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sisomuwifusajapefu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5p8ih7tl0cgrttjsaifcko1214/mezarotoz.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160f210a37b704---fadubuzi.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210830_3F98BAE7D8E62456.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f179c662e---rulebugafizuwusuj.pdfIn PDF document text
    • http://tayles.com/uploaded/76842118769.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/35404510225.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ec612a6378f5b96ce92e57f320056a0b/bonexusiwebamal.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92425d9963e28f6ab17378a992268b4a/jetedivaripomidoxa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-11/20210611014559477531.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/64626747740aa68de5e4767fe8e17c13/7931270075.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608191425614842.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/57718406672.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3b787eb6cb630d0188adfab20a10d7d0/tufazarukupida.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81198684f---61751837210.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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 19708 bytes
SHA-256: 69c2912910b14ba0b081e97b21c26cbc5ed7660afc499e1430b73f906344780d
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 11180 bytes
SHA-256: 6386a89bd549713d6202c02ed46aa0dc0f7b8facb96d0708122927001bb5d933

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