Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae995e74bab176e5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 19:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d40bc36fefc30129d1a22c4f86d2f8a5 SHA-1: fb298c5ef48dc1798fa9b2d009d108d1c698e98f SHA-256: ae995e74bab176e513710dfd62381cfca315473a5ee675f4de3a821348f5df4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=watch+wonder+woman+1984+hbo+max PDF link annotation
    • https://fullprotec.com/ckfinder/userfiles/files/penuzolibujuxokebas.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398874ab9c2---42901977925.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zabinaxidegogebase.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210906073414.pdfIn PDF document text
    • http://naylorrealty.com/userfiles/file/gizuwekowewamuniwusop.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210920034452.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/8047682324.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/42027267895.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328992026d9---vivow.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/41944912781.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_033113.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56bee474fe94c403fd98865373d308d9/62983481947.pdfIn PDF document text
    • http://sbcnepal.com/images/file/27118885599.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/15357424560.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gudosowi.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/dokalasab.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/mibogus.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/jonasoduruturibebodog.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5ca6d6b0da22de20d197a7beeafe2ab1/mazijegavepofuxosejofuju.pdfIn PDF document text
    • http://newcityhk.com/userfiles/93763868475.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/jeradat.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/47959251902.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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 11156 bytes
SHA-256: bde1653864ae7666020f62fe19e2e970e5ef47efccb66f10074be0809a52488d
font_01_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 17476 bytes
SHA-256: 53f75866aad906a34ac41ce642ad227d27bb3d97cd79f64b40cc8c3783db2158
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1