Malicious PDF — malware analysis report

Static analysis result for SHA-256 c990d2c740a04bf7…

MALICIOUS

PDF

85.9 KB Created: 2021-08-24 23:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4c7427e488f7265a01ace14bdfe31b0 SHA-1: 4ab2f088897b206a283e2126a3c5e6266571c129 SHA-256: c990d2c740a04bf7bbee1e5f7b7cc1c18660d0bd1da27b5cea7bd9cac919b4a2
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm characteristics strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://brilspa.ro/userfiles/file///35700297135.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4678e5eff5cbb72f1ab6ab182b3be1b5/kozuxosavezoti.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/zinerivewufewisafaribe.pdfIn PDF document text
    • http://napiarsaigh.com/images/38828341047.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/36729574933.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/84765074201.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870148b3878---duvevikefafitubata.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/dukov.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b94101435b74fa5c0cfd2099945a3498/83298560120.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n3npmlrtqmsokjkb85rbhjlm3f/84543083840.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jupipakapejomezumepubudok.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/gidobewesikamuveritoz.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehkhhq568ah825f1afsk0c87lt/nufenesanovuleget.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/96401380598.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/34718895415.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/20523082617.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f71b57a39a1459393361f64554f31a90/tawedefu.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/detujikogagigorewoxa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ltn2du5tmoq0aqcbengac1unud/linosiwax.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a5d63866---vosazizepafula.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/64223057179.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebf1a45cf---52023801332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=film+theory+and+criticismPDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 20200 bytes
SHA-256: afa921bc51ed9807beda750682ccfa9708e2bd90b9a9f92770947aad63a77efa
font_01_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 10724 bytes
SHA-256: 033dcdb062db4bec7c416ef982bba7ef2e87953d07c65bc14e3e993b4b148d87

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