Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2c85306115196e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 21:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db9b41220f403999afeac0f0036346bf SHA-1: c60af577b4f7ac2eb8a217c495e40d86d6636fd7 SHA-256: 4b2c85306115196ebce5538340f8dac993c55d2dc4219ad4e4ac819f9325fe68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=android+automatically+connect+to+wifi PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c466a6a089ea0288dc3a66f582fdc528/tikunuzovisulakulejijem.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/85713148070.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/27494305687.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/90445072003.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/modixokenenobula.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bnomvkfa9hgmarvnh28da8hdti/73204897960.pdfIn PDF document text
    • http://thegioioto.store/upload/files/bewenelumon.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vulonigadejoraj.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/39800467572.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/32793650722.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/vozupokumijosijakagorox.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jikedadazorimigamovudux.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bixosejuvikarejelizarug.pdfIn PDF document text
    • http://cjatkinson.com/userimages/93254794942.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pimurivebonomizeludibapa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4aecf124---66409959705.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79930750119.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/gisamewanujibafa.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajewekewomuwibi.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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10752 bytes
SHA-256: f3912374794c9df60375a461d3ed35d6322f2c2ebd631ce363278dee4a976860
font_02_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 17344 bytes
SHA-256: 4a0f523d2e9c7a1d737988c1ae0f538042d2faca5337e96dfb8dae6fd2d0970d