Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bb4de3fffdfdf1…

MALICIOUS

PDF

73.8 KB Created: 2021-06-29 03:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f6a6987adac65268ef4d18f7cf9ccb98 SHA-1: 11e408539423f3465a559625d69389e760de607e SHA-256: d5bb4de3fffdfdf1ad545ea9a087365c998ec90f7e28522ba1e517c8f03d81d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, distributing numerous links across various compromised websites and disposable hosting, likely to redirect users to further malicious content or exploits. The presence of external URIs and link farm indicators suggests an attempt to lure users to malicious sites, aligning with phishing or exploit delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=states+of+matter+in+order+of+increasing+kinetic+energy PDF link annotation
    • http://bhavalaya.org/ckfinder/userfiles/files/26850415515.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/33426871637.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1e77a9cc83597b730c06a3356eef7629/65847741733.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/66270dlfksf52l9maumgmaaptn/fibejemosukerum.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c366e2da6bcaaec4f18d4995d3351178/22917977628.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/10j5fp795jd0rf4knvegl5qveq/peziko.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/sudurefavutazesenun.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210618095953.pdfIn PDF document text
    • http://bienbao.org/uploads/files/75142600827.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/33820153554.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xojugebamotefinigaloraxes.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/lumebojutidotonirogoju.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vitunurojexemupedomin.pdfIn PDF document text
    • https://flyags.com/editorResources/file///xowafutepupuj.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e6f260a9---dugawoxuxowebobimevuxis.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/22fe917ec0e524400446d487218f11a1/suwatokikinosanob.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/1caa110dca3e173957ac1a19c09561fa/sepoludofefamitagudatinen.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/09e557200d01d62bd6dd7248e560adb3/bobadazexu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c65cf42716320368be3e1fb828fbfeca/73529234019.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad835b33a7d---26210430182.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a420149810---8546306813.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/34289477778.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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 15492 bytes
SHA-256: a6f8ed3660a9969db9f4e862a9012eeb8f071187c5c0b14bad270d84118a6d95
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 11056 bytes
SHA-256: ee7cf7f986a7eab7a4924a82d70e42e66ca04e4d8660374d069bc51f79533183
font_02_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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