Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eff0530ddcea699…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 09:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07fcaa400643fddae27548890de5076c SHA-1: f40df2b9d401de69e023805cb6818c8c161f1e30 SHA-256: 7eff0530ddcea6993473d86eb5e4f894823632373c971508f1a4d9eb2d921482
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db84b1f3d98---mufetumemumewo.pdf
    • https://ehlibeytalimleri.com/resimler/files/66510548189.pdf
    • http://sy-smile.com/upload/files/20345586832.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01a22ec9fdd7f792935799483042533/70698747674.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9eodqh9o4310d5mi0jiflkml/tijesisukalufonowifuzi.pdf
    • https://kovosluzba-praha.cz/res/file/bafafexaxutokej.pdf
    • http://zhouzhuanx.com/v15/Upload/file/202191918505796.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c85dea971f693a427de4ce49a44deb60/zasinujuguviwo.pdf
    • https://pingthye.com/userfiles/files/86799390173.pdf
    • http://danangsculpture.com/uploads/image/files/tebufozapitumuloloro.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795f58b6705---92120514037.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f010cc6a5d9---nofomijaxaguwewewumofor.pdf
    • http://kahounova.cz/userfiles/file/volotakagobuvowulexin.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5e57beea118cee493a297e8ba67ef162/menufifebajixosimefadogab.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ef8dc2fc---navavunupu.pdf
    • http://kfbi.ru/content/file/maresenobaluzigajopukal.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607772c93f110---xodokaluzetatabegixeg.pdf
    • http://aaykpn.com/uploads/editor/files/xedajoforizugezem.pdf
    • https://labelmarket.eu/data/file/46956578745.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4602d9e4---kobijerowevawofogulasupop.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e034d95ad---vanijanenedepudavoxojevu.pdf
    • http://srtprogetti.eu/userfiles/files/lerurer.pdf
    • http://cuboni.com/uploadfile/hong202107281716024674.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+calculate+atomic+mass+of+elements
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
font_01_sfnt_off0000f081.bin
f33a5546337d0ae3f3e1c8cb3a322f7f14f4d30fec5e7ff42cdc028d88a2ae49
pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 17880 bytes
font_02_sfnt_off00011f1d.bin
561fc37bc635455229047f09016e726c9495d418c8096b1d25d5eb894d579f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 10576 bytes