Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c7d53dd2b4d7f6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 00:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75fa173763d6ca268862afc3782bae8 SHA-1: 3cf158f2a2c4e791c3db7fae13d9d0e570410ac2 SHA-256: c7c7d53dd2b4d7f6bd601c8e2865a279193735e32423a63a09af23f8326fa9fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pcserviszlin.cz/ckfinder/userfiles/files/banubifasefuwariratul.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/i3jv41po1ta908v9ktgt9155os/wuzuwumiduwadanasevajot.pdf
    • http://bisenzia.it/userfiles/files/pibaxif.pdf
    • https://viessmannboilers.ca/fck_upload/file/kikusifilabizebijujijul.pdf
    • http://avision-italia.com/userfiles/files/megeriwepomawom.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03384a77c---95387166040.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d23ec6b0---22056276007.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2af1a8928---gazilidovegewaz.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608328ff2cf3c---33881171899.pdf
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/81547937951.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85e91dc6e3b817606eb6265bd969dd2e/dogesudiwux.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q2m83f6v7uf6apfq7a7556nio0/52605965224.pdf
    • http://clingac.com/d/files/masiridogesewawok.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uopfsfit28u3v8jmam40tunivo/99188869039.pdf
    • http://euro-ex.net/images/blog//file/togavu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c619c6f368a05b703fa09c312e75aa3/55738419689.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9acf8467eb---nameza.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c06de1f2---15563520254.pdf
    • http://ahxxzx.com/userfiles/202104/file/58415761262.pdf
    • http://cs-web-design.de/ablage/userfiles/files/14444026577.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a417bfa996b5673bf8696741816ddc1/jorakirefuk.pdf
    • http://alexlunacoach.com/img/editor/file/jibuzamotodetige.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbpgvok7l80hj9305tb4ifs0b5/vuvibazavapofumewitodo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+hello+neighbor+house+tutorial+alpha+2
    • 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_off0000f467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
font_01_sfnt_off00010c79.bin
b2ad55e61edfccc5e3e8104eca29aced281712598cadf97eaddbc3c07ecab9cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 17592 bytes
font_02_sfnt_off00013974.bin
f63ad64ff90acf76948bbd490c8f90cb1c54c330bf059698ba9d0d740775e29b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 11112 bytes