Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c030e1e259d481…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 13:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e9628bd05032aa2a81d3626d17906a SHA-1: f6f9fd7c7352303d01122f20bca621834365e8e1 SHA-256: 42c030e1e259d48181a5eb8b98b86438466b388694f736897359b045c7a28e87
164 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34b415d8d---84421872048.pdf
    • https://servicepapik.ro/files/lefopofudokeporu.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/36819417764.pdf
    • http://bellina.pl/userfiles/file/rutobaxisexotibikaj.pdf
    • http://akcjonariusz.com/UserFiles/file/78184245505.pdf
    • http://hncastlecable.com/d/files/sejox.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/zelaremewobiw.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085318d31b79---52598964513.pdf
    • http://sumosushingrill.com/uploads/files/nivuva.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde761ff35---26976688843.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a3389f4e---kinegilizerepedi.pdf
    • http://willbramephotography.com/44396836056.pdf
    • http://kientrucnhacuagio.com/upload/files/nepas.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/bufun.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/53585825763.pdf
    • https://kovtec.pl/eurostyl/photos/file/86298160004.pdf
    • https://soechi.id/userfiles/file/49176714211.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/15985774559.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/nokokuwixususegetugegili.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/sqbckih3ttqk7rv8t4q44nnma5/44551001921.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b637e19a---jawopobamelofimob.pdf
    • http://emannsltd.com/userfiles/bisugiwibuposala.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mengubah+file+pdf+ke+word+di+laptop
    • 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_off0000e19d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16792 bytes
font_01_sfnt_off0000f9b4.bin
c50aefcb1da09616270d4e5f9eb77f54b182791e61e888d91b76fc5cf2ef47c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 11020 bytes
font_02_sfnt_off000112db.bin
06c407248f6e4d57612482d003d8b56fc864de6f275508289414109a3d3388e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 18588 bytes