Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf7a64874b2dc8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea5d784fda5d1407ecbfaf301acd4669 SHA-1: 365740b672c4deddf63e26d1b583ccc1838ae52b SHA-256: 64cf7a64874b2dc8e15af4a8adc3f6437b3d25b583e7568b15b7524f6e946e96
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm hosted on potentially compromised or disposable domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=marketplace+android+app+download', suggest a lure to download malicious content or engage in phishing. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=marketplace+android+app+download PDF link annotation
    • http://eltprof.ru/userfiles/file/sejosufitikafisesagi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/003237f41ee9485f6d2cb3a88d893b24/muvapot.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/92301658691.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/76219896932.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/duxoliwelubupanaxefef.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/46509286704.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff71757ab8---witabupose.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/21192111441.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rr5se9id3jearfq3a66de8poi6/40357047017.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/lozijovudurakavugojat.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/tisafekagofidosizowufos.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/vasekebodiwaluzusokegi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/40006305596.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091712443851.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/87261440929.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/pizoduxisotu.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/67182982169.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/13247280725.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/fopabosamizaxoratovazitek.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/46067205515.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/voravuban.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/zirexa.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/pesonefa.pdfIn PDF document text
    • https://phr4u.com/files/debifubexeto.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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 17532 bytes
SHA-256: 16545c47e95f0f7f45174afcc2eaa890f3e7bfa76778dff4598c952d10df48a9
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 10512 bytes
SHA-256: c70669aa354f392335c7e51bc701f2dc27d1af25c6a46fb662938875f6cf568d

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