Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67ad8dc2959a2e0…

MALICIOUS

PDF

86.8 KB Created: 2021-08-05 13:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 815f7b22750c216b2939a8850fee371f SHA-1: efd91ade4681a50a83c3f54afab2bbf5b2692cc9 SHA-256: d67ad8dc2959a2e0da42bd3911c1de71dd5b83afb2cb9f6d0364aea188ed727e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://mystruggle.uk/indigo/ckfinder/userfiles/files/bisamugexinanebuw.pdf In PDF document text
    • http://sibinetweek.ru/userfiles/file/jatos.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/zujukanopixudubaro.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275e970c92---83064760891.pdfIn PDF document text
    • http://atiksigorta.com/files/17581873356.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bufaxewa.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/4614477657.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a87005ea18a---87730369124.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kenevibomoredomofoxubugiv.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d7e3e7af---21592160323.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/17770631338.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0839b19c4---72274989578.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/8769188150.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kigukutekuduka.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca8ab937ed6c9137434573bdf5ca7432/moxulukezajet.pdfIn PDF document text
    • http://ashioke.com/images/library/File/manefonekiwad.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lugov.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210607_17D5DFF8A136BBE1.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1lcr8m6amcd55o9q8bkspme5b3/nusataxesutawawirit.pdfIn PDF document text
    • http://findplusltd.com/file/jugabeza.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/t37mm7am04bhbmjj0qc5r22ua7/37567568289.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/wenum.pdfIn PDF document text
    • https://inncredel.com/uploads/zexujor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=les+accords+7eme+guitare+pdfPDF 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_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10920 bytes
SHA-256: 552b917baaccff78ce2fff9ebbf1ff0b19f23454f15d21cad213a4d24288c672
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 18792 bytes
SHA-256: 2b52b59044e8bf1868fa89ae343a6665447c85f09ed6745c260269ba998de59e