Malicious PDF — malware analysis report

Static analysis result for SHA-256 07713420458a1e7e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 13:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8aa758a284f617d472e152a055186447 SHA-1: 78bba7037d9031494adf0bf6c05a91d2d5479bf7 SHA-256: 07713420458a1e7e63bba8975df63c877562700a7f14499f1d75baea23568518
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in URLs further supports a campaign-like distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pixomot.ru/uplcv?utm_term=cocktail+piano+method+pdf PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613715ed5c0b3---5955293213.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sogufoligulididawowo.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/22598758614.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b871efad8---22845690791.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/wagubekozi.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/funid.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/norugot.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/76486314321.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/63536597608.pdfIn PDF document text
    • http://mobitransjogja.com/files/dawakutikexigizor.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cd15780420ae95c81163902e2a9edf5/zukodeti.pdfIn PDF document text
    • http://rivucota.com/upload/files/wizab.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/sixazanefakul.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rosojumiduvar.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630454771/files/vavozusosorediludugolej.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/43678188548.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jezebotedunixesovuwiba.pdfIn PDF document text
    • https://mlspoland.co/files/file/fidumuxozimimi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/gozuke.pdfIn macro / runtime command snippet
    • http://czerwoneiczarne.pl/files/file/37730800794.pdfIn macro / runtime command snippet
    • http://barcabianca.eu/upload/file/28145901883.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/sofazemijaw.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109081414157657.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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 17040 bytes
SHA-256: fcc273f464ce5dfbe7e64ec3e6b98ed110e413cffb334419ebc1678889062e14
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10740 bytes
SHA-256: 5a66c331f741fa2844b87754c413cec2447a418d651de0132de05ab2127c30d1
font_02_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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