Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fc0905899d4cca…

MALICIOUS

PDF

73.4 KB Created: 2021-08-15 00:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8547ea7c81c81b4dfdbc154ef71e6c9 SHA-1: 26f5f554cf2d5473962c6096bc1a94d1dc5f436e SHA-256: 66fc0905899d4cca6e369add08def05365d53bb43800a7a8019d90fc7e5e78f2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external URIs, including one pointing to a compromised CMS upload, indicates a likely multi-stage attack involving redirection to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f481185635---70111004695.pdf In PDF document text
    • http://diysmart.net/userfiles/file/zetudikagovidaxugiku.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfe4cea9b---79895697259.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/0m75lfhrbah6tj1fi01fm7hp22/zovavap.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/25530750880.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/18091035266.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pk7t8gkc6j5ud2duis5asjab17/39105626466.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec524dbe38---3962513587.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/kexawipofesedabupit.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/faxibiramowuwurokub.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/nejiparesanetolemolete.pdfIn PDF document text
    • http://htygroup.com/upload/files/21779576943.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/dovarujiduzuwepu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/fudutoralom.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/mepatizibigepunawud.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/6998132822.pdfIn PDF document text
    • http://lagrupacio.cat/file/73622548445.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/guxosod.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/82097385051.pdfIn PDF document text
    • http://446888.top/userfiles/file/37470393177.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=i+am+offering+this+poem+comprehension+check+answersPDF 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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 11008 bytes
SHA-256: 76ea272b35d8f0e454abe5e4e85031f08598c1c351f9e5d8901208bc43f9ff56
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 15728 bytes
SHA-256: 438c587113a75a1001ba516cf0c5255a09d92771e9dbc1cffae300aafc05dfbc
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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