Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2f9ed5df0c603d…

MALICIOUS

PDF

91.5 KB Created: 2021-09-14 21:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72fdc7f904f5ac6c729bf6c264c98983 SHA-1: 74b9088d7da3741a4e129645ffca14cb4cca9636 SHA-256: ec2f9ed5df0c603d30e4b815ebc1ce218e05924fdc50a6888e07c1b55ab433d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=last+year+winner+of+indian+idol PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fe5sv2eq541fillijqtsaiet8u/nirijenukavadugukubisopej.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b7352f491eb937821255a70c0fb84fd/navexaxopakinen.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/besukadiliwenomof.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/33248290407.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/xibuzorarefesovekuxoduram.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jujekatusorewuxelazura.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48136520696.pdfIn PDF document text
    • http://badgerhillfarm.uk/gojotaxomabakatoduniw.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/59759490221.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94373224696.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/boguzixut.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/m8a1m1n0pilvo4p3f8gtl1t1pb/koduwilomomulom.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/46018111031.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/26389011401.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cf22947a---25297636613.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/60293068951.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fonesepaduxivudozazew.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/wigatigewezinerize.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/21544536644.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/biwizifutagipasol.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/gexuwunux.pdfIn PDF document text
    • https://lapakunited.com/contents/files/53398754610.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/87077783144.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_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10504 bytes
SHA-256: 3dadc8b7ba4356fce527d6aa2bff74617ca5f6c610db3f71d9ba327e1e314718
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 18112 bytes
SHA-256: cdadbd4b3d43ab558e7f4948ee58c7b70d9e02a520f883f3c2b76d3c1f15a12f