Malicious PDF — malware analysis report

Static analysis result for SHA-256 585fb4fc795c6fa9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 00:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8eafaea0b7264e59a337278faa89ab4c SHA-1: 4e39e0d16a7d367377679f49131d1986a7615af9 SHA-256: 585fb4fc795c6fa9783b6fac06c217250a3a8a689f8dcb197c4a5f3e90ba30da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=remove+watermark+pdf+document PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7e97a0fc---gesixidi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/rezatuxobuzizizemetise.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6408d18f4---fipaliwem.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b1c725e66aa9a816067b51e392a6e202/tevaravoxavubizufuziko.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612773cecf1fc---lufixojozegoxabif.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/noxupufo.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/piwusilojazew.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/madedabiluse.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73931229835.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/toligu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609839e760d62---3703031307.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/d2lkqh4oohmdoh2u8239p283c1/72706809998.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/69142846586.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xibar.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/33ca45744d8495507a6ad9b714a8ee67/pemasozov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d32a2817f2---vikukonojuwevuw.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vikuzirilakaparonevez.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a45562db15b---30932751066.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b863b42b---44365107520.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/pokesizuvaxuweferefo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109031648364947.pdfIn PDF document text
    • https://ikansambel.com/contents//files/25813446063.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/mugegijube.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dokegojanajetitixiga.pdfIn PDF document text
    • https://peterdegendt.be/file/23404215193.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/40e8488017bee958fdbc4eaa35d43f27/disalewi.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_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 17608 bytes
SHA-256: cfdecb0e4943d75393e086a60c40db4011ea260d10c066b07b88a1ad34ca5331
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10864 bytes
SHA-256: b0979387fd4ee8c1c47dd8ace4df527352ab6e5ef107fe6885e1e73e42190c89
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1