Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210401b6fceb2d3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5433e714fb176473a9dc68a4666bbda5 SHA-1: 81419c153ad73da0670e8bfb7e0d9b644ef09c4b SHA-256: b210401b6fceb2d3f43d6be4d83e5bfc4174fcad14606902a49461c2b9f2143e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential for JavaScript execution to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ekopaczka.pl/imgbrama/files/95999786625.pdf In PDF document text
    • http://turnyras.lt/Files/file/wafosilugenukosepura.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc441c0b93---62914953187.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/6223154041.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fujisekuxoge.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/66a5d3f83d259818d632dbd3490f130d/77419155476.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ec4b32171---susewoxowukafezudu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/71756953501.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/salabon.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tamiwokukerufedef.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/mabizevedu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a577e46b---62674078314.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3322f17f---89494677862.pdfIn PDF document text
    • https://ismart99.net/upload/files/22055297387.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/konalis.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/5319030772.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4ed9e57f8c4ada8ae3c3c6a1e12392a1/jesosarukeriregotemim.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10257272651.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4fb959b28edeec6fe3278850986f6724/83923320303.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/43787613505.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161385a7354b0d---xisiwajogogakebegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=english+grammar+verb+pdf+filePDF 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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 10916 bytes
SHA-256: 41c1b624c46a11fcfc7209c0a07b2930df7de305ffe1aee93fa04912149874b6
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 18632 bytes
SHA-256: 7dcc0e11a85e2f6acc113b0091e55816809bb66ce058c39c6aae48bd6a686a57

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