Malicious PDF — malware analysis report

Static analysis result for SHA-256 d585e4ece34e4e7a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 23:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da1958999656ca6dc2e13fb2a52ee507 SHA-1: 763124baabc0a1c504bb97e2557456f799148d92 SHA-256: d585e4ece34e4e7a476e9a664e766bb90704f4eb3e546e3815959d8844b6f6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b3f11480---72420571755.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51ca89cb6---10019653231.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/10894093229.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wutavasagadazorasile.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58e095e61---10018326267.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/wekepakomebusuvavivufubu.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles//file/razumijage.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/59658404873.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beaae4f2db1---59812182300.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608554ca080c7---jolap.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5ee1781c3fc80a2781747db5e1e86f8b/wowanomemodunimal.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/68821718417.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f48de1a---denudinubesaki.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/3354932825.pdfIn PDF document text
    • http://faradbox.pl/files/file/jojizut.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c6966a6---jidarigiruvububozobo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7180d6ff---lefobarojibaraxerusuwuka.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/57049455315.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/nimugorenuzubigufov.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/misawemanowukasawobapug.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085875c5b394---37842379960.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hpjtsoej28njb811vl7eu3rhca/tenatizasejet.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/fevijamemuxobuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab62b4d87---8887983203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chronic+heart+failure+case+study+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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 17676 bytes
SHA-256: f8137111970d56d557104c790b8068a661f6326b73fb84f9802a050229e3c5b9
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 10960 bytes
SHA-256: 25e78ee35f106798e0bca33cd576b1689dfa92949ac67003f8a50e0c9cc8fb4d
font_02_sfnt_off000129a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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