Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b79089514f73b0…

MALICIOUS

PDF

68.8 KB Created: 2021-09-02 15:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c553cbcdc6942f325fb40caf45405859 SHA-1: a6c9cf612cb0e8d8dc7ce6795764a61123da96fb SHA-256: c6b79089514f73b0f602ba7bc60528ef73c07a01e0325a8c9bdea90b2f410215
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting. This suggests the file is designed to act as a lure, potentially redirecting users to phishing sites or initiating further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=exemple+de+portrait+physique+d%27une+personne+pdf PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/88b1974a1ca9473bcfba644e21cfbaea/kikujepiwulowenarixefo.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/23165727778.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/filiboz.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/dozosuwinerutimufetugo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b24875cbd5184efacb77522ee6b2f77b/wajujaxa.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/65256482504.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/16123708287.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/jomamazutatalalikoratus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e958bf3cc---56573501236.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/8945870604.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fc519cd9---zorob.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/lakimapajubugula.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/21344343594.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/19725496330.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///lagapukikuwovozemet.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210807_225602.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/zapovosevemuwinivok.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rodabakulobumeter.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/65990270106.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/80276458213.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/r1cjvt4i4oeoggaotlfcu65qv6/11560597213.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/48381409943.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fatujejuvuporuxusuvanefu.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_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 14452 bytes
SHA-256: fb2f5e72c3ee20af3dca702aa46f6cc4f47a5dafe78b7f6b70de7645cb8daf49
font_02_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 11244 bytes
SHA-256: a566dfef8e24846b797e74357ed9bf49d126d5891e8f1b8ccfbbf430ac3ae129

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