Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c27bbcc7fd0fda…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 15:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d16f718a924ff4877f76647a0e4c727 SHA-1: 4a0830a4d7b101668a18b3da8e8124363908b995 SHA-256: 43c27bbcc7fd0fda21bd2aaf5c9452505a5604352e4d0e8fddf9ee690aaa798a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cructi.ru/uplcv?utm_term=ldplayer+3.0+download PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a76fb0b---sibutixotonubimujavonen.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/93692111033.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/fimawemavidoluxewuve.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b64jp9ps22t71u2lm028hsehg4/4407132602.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lusofugaxalav.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/75241640158.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/92442815541.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/41505514430.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/xogarotizelo.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/14535885593.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/68979176450.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b01dc01c6---39874520942.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zuvina.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146978056d50---jajalexoput.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/33991250758.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/30671736894.pdfIn PDF document text
    • http://w-mill.jp/images/file/82928704246.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/45043713411.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914090854330919.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/voraj.pdfIn PDF document text
    • https://huanghecables.com/d/files/zamilenez.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/88997911882.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/bowamusudedi.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/dupapive.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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 10544 bytes
SHA-256: e99c4f49f3769543ca9f627ab35a41613561cfe008409dfb908094e3cc8af5ec
font_02_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16652 bytes
SHA-256: b5553f552686df13476bc4fe326e2c23694fcf442bd667900de99ef808e8f349