Malicious PDF — malware analysis report

Static analysis result for SHA-256 4441670b73ec1aa5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 13:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5a83c29be507da059deeda8282a82a4 SHA-1: 704e4369c58ec8531c27a78e0d4f069e40dca53f SHA-256: 4441670b73ec1aa5e5e978052ca90159e211cfcc8f934d5d83bf1a664f50f25d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the heuristic firings strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.funes.gob.ar/ckfinder/userfiles/files/gidapeduxixofu.pdf In PDF document text
    • https://loyallcanada.com/editor_files/file/70880285321.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161412b13b648f---mulezotew.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/82416729877.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/buludenasofupo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f0nq7hk3j1rs2m62br52ufvjdn/dewifufu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84411601173.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd50ee6a96---4887282023.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/gusisolalozusomil.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2e2d916f---tuwusuzederawe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5da2cae---59124535690.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/32432825927.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b50efaec857b52bf984aec24b20b9a5/luramofevadupoko.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/72710605020.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/gawadijozuledinimam.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/18474383117.pdfIn PDF document text
    • http://charontrade.hu/data/file/90723000988.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/89627904521.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/garukipomito.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613df12a78af4---vugawizexog.pdfIn PDF document text
    • https://ka-base.no/images_content/file/57932011777.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/63318220585.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/xejali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kumkum+bhagya+zee+tv+serial+full+episodePDF link annotation
    • 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 17808 bytes
SHA-256: 867529df0bef64c73f8100c5ae0a612e45221836b789d4029b1b2f785a36bcb5
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 11404 bytes
SHA-256: affc2e0b5d7bd633b3b387b4bdaad18b0a23c53f1f99857218c8e982c4c00604
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1