Malicious PDF — malware analysis report

Static analysis result for SHA-256 9371eeb3eecb7614…

MALICIOUS

PDF

101.0 KB Created: 2021-09-03 05:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 93274c08a7dde8903f4ab442ba984c26 SHA-1: 6f92f2b0dae0eb9e45f637a6897ab4030e3a0e08 SHA-256: 9371eeb3eecb7614f073533358a94212ee48f2d0fd640a40e8ad69bfc2316ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16104aec75446d---8648795418.pdf In PDF document text
    • https://dailyhondaotomientay.com/upload/files/faranuvawu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/zizezonilupadikumodital.pdfIn PDF document text
    • http://boldogelet.hu/media/pilutonekitofibuvo.pdfIn PDF document text
    • http://tano-cable.com/d/files/zofumuxapozoretojede.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/80675653726.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/49269482714.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kuselijuxegol.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727cdd155ba---batafamekatavapejejemonol.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/60fdbadadb3431cf0449628c8bea391d/wunonoxapeli.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/vitajisunupugin.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pozadejodogarereb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806547d48a9---mafufamukufevakoputirabuz.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/62871196247.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ee24e1dfceb7fdf171804861554d0b4a/12069022937.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/bemajokibag.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/66547224624.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/27910913085.pdfIn PDF document text
    • http://sbairs.com/datas/files/30121426248.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/13446113759.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/64412649179.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/19264f696effa8ff215cd34e89e0670a/53361462083.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/zepamefa.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/parobetoluvaguxuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=deviance+conformity+and+social+control+in+canada+pdfPDF link annotation
    • 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_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 10960 bytes
SHA-256: ad40d9986dead10ed1942b7bb6f9aa8b4bb8b48877a0f1661540e1390d4c39a1
font_01_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 18368 bytes
SHA-256: 3ab5f558167abfe0d923a1ab82356c6d8cce7f21c896106f34b913a20b078711
font_02_sfnt_off00016dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1