Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa8e132898e5f2c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-27 00:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a4f825955c6dcd194aa7fc1331f6696 SHA-1: a37b6c90ff1b87d279ee0a56023f4da2904a1620 SHA-256: 2fa8e132898e5f2cdf88b2ca48ba1aa9e90c7b71ca0d5b3bd0ae9f193ad306d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites and link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests the use of compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, with the primary lure appearing to be a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=prince+of+persia+the+two+thrones+full+version+download PDF link annotation
    • https://tectrongim.com/uploads/file/sirizag.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ruparitupibarinonugukufi.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/39640582658.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/budubexerunupikosidibeka.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/11334403809.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/sekoxewevegetoguzoxajinup.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/43083244073.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143f586bc29b---bijosanudojatunekabula.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/45342451691.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///34061085443.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/latedozovepanug.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/gepuzi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/2779747312.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/vobesomom.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/vemebetekugibukuwo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1365bc38096a8639c9aeccdd83c5b827/bilaruwibevumumawomawimis.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b64b5fd6d232c64602953f097ef300c/xolabitowi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gelelujupu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/44406137426.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/45607205263.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109080315393722.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631980703.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/mejokedu.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/kekobiwaviwise.pdfIn PDF document text
    • http://belean.pl/userfiles/file/64596790459.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/923c95c5fc43d8ec3d7c25543066b2a9/17765337400.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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 19188 bytes
SHA-256: 151f3ac22bc2a7049883656c34086fab12c54153e3cbc74ea6fcaa5b311c496e
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10972 bytes
SHA-256: 4c76886e10c4f9accd7fddee5083d1b8fa1312275eaf5c6fb33f95874534adf6

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