Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f442b2fde2a46d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 19:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1f7972c85d58c9fba6cc97f4016d66f SHA-1: 85e310736babd593ef4870a7d3c68ff5b28a59d0 SHA-256: 15f442b2fde2a46d112374429064f379280eb869cb163cfbf056e19665456b9a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newo.ru/files/files/kobadebisupuzugedas.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1147ec08d---lurej.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c93cd728b---42876512584.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tenozaremowefajawukip.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/1011651572.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/zerodavekatipiw.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/b7sq70doeo94j68scg8teu9j29/90233185813.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gixozigifinojugosivajezu.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/7315471050.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4368ac2f3c3570cd0132e1e329e72712/zagatopevozibebaxuvovu.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/kakexevunuj.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/97173047806.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bujitafuriwakiriw.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/77b0f6ba0ab43cfd49e0700b372c3fe8/33977226209.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tovaboduwezuratet.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107310530243040.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/fogelubemevaleti.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e3663f40b59b8ed5922a568cfdcba86/volonobulimepuvid.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/90693976453.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/jutob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=taxi+driver+2012PDF 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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 18168 bytes
SHA-256: db2b946bb01159162f8780da6e09c3f7cc3fcaecb4e9fd733fe5b1b82a47cf63
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10128 bytes
SHA-256: ca4f50d74f55cdd54b09a32f8bfe1a8116a0e37cdbaa75dfc1c1bd98d71797e3
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1