Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b32ba81e3a5804b…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 01:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d6e8ce796505f1659e6b6d876eadf85 SHA-1: 001c2967638d920e75f261fe0b7400136c19e7ea SHA-256: 9b32ba81e3a5804bb4e2be75a55665b05552da058e71acf542dd80addf5a3d1e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=by+name+meaning PDF link annotation
    • http://capmar.eu/userfiles/file/25087334380.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6c1562358ada02fcd9766d2d0dbde4b7/17414782158.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109282215045043.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/44490132026.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/25462328674.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/8779939675.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2194ef273---zokasimujagiwelida.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bunibulinadawevogimimagi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/powefex.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/pokalaragulunimamirawug.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1615575bd93ebb---fesuvufuxol.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68308148167.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/80577167445.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gebigulawu.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/zoputebipi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a20be4484a---13245428599.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/49303290872.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fv61bpn3j86jil07je2htnbiq5/roxujavexadiwol.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///44468432479.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/lojulozedevipolopawi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aee046c19---kokij.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/razetivixivimape.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/gugavinok.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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 15860 bytes
SHA-256: 1fec04a4298b45cda416095085b3aaf289be83adba5bdfd1888c344156689930
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 10088 bytes
SHA-256: e80651286e1c5b37059fb559b710a6489227d0eb05850322eaa5c1d5c77b1e8a

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