Malicious PDF — malware analysis report

Static analysis result for SHA-256 3938ddc10cef1500…

MALICIOUS

PDF

76.6 KB Created: 2021-08-12 10:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 541c33f20a18d62353cb0f56ee0aa6f5 SHA-1: 9b09f083be95d9dbe43e5597208ab9cde564f85c SHA-256: 3938ddc10cef15004518a18ae757cf29b7bbc4d7648da616bcf9621af89bf6db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics as a malicious PDF, including a critical ClamAV detection and a high ML score. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/meqct3mbkcdgmhsgbumk5jcs12/13966645685.pdf In PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/16026315144.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • http://aa-nusd.jp/4833339472.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/folewuxaxakojiligonubupuv.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/f163oundi795q9ota1977bn5b9/lojidefaviwazenaziz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853b7831101---26368082817.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ndjr8f6hlv303cvcqqv4iqroen/4382187533.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a8653ddf9---wasugasajuxala.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23fb8dd75---21241304556.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/91756190310.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/10004626822.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/xedeg.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/wasalidaxujiforoxevoxujeb.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n2eu74hv90s95vgcfgpg9fbf74/98901564101.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a795f0b4caa---zazubi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/39308422287.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/zifekedas.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mapipuganinod.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/12489838915.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///3281609287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=zara+zara+bahekta+hai+mp3+song+download+female+version+remixPDF 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_off0000c44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 11624 bytes
SHA-256: fa7004e3551224815bd4727deab1826208ad3bcbfb92f5ba83875f1e3f15f4e9
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16852 bytes
SHA-256: e53beb1bf272e19f361fc38c74f76e96b9707238eb9cb9c2028cabb42c3a9b58

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