Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb711d9a63c1717…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 09:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bad9392b9b92003931775310b056de2 SHA-1: 4ea0d39e02c1e7b2d94a6d4523d707e9f4526888 SHA-256: bcb711d9a63c1717ecf0f105939c8a0963353b4940e405191a559efc1c484f4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting the primary purpose is to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=backup+android+phone+apps+to+pc PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/a06iei04fh2sc02lohd9liq1hu/xosawetadil.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9188rl8o77jpoapa57q8f6cdth/47957861727.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/47486957066.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/95473463849.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/27702959264.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/64849490651.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f012e5cd---6302503206.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jaxurabilasutu.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/32035354785.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba478ec196---nuzelo.pdfIn PDF document text
    • https://thepainter.asia/upload/files/25927678953.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/74867591246.pdfIn PDF document text
    • http://coffee33.ru/archive/file/35433315390.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/44617377061.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901165347092961z68ulgyrzd1i.pdfIn PDF document text
    • https://onlinendttraining.net/files/65820509472.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/12231641872.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/rilafaparejaxepudadiz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fv72v8abugmkj3kdmegb14bl83/86813240440.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/17412380821.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ronodizomewuware.pdfIn PDF document text
    • http://salwex.hu/file/19656342643.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902100813.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/tiropixilufove.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16480 bytes
SHA-256: a4016e888d1fa11bdbfd78212bbba0229adc390cb119a8e4b7eb12ef3377bef0
font_01_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 10808 bytes
SHA-256: 626df9ca70cf803d1e33017fd51dad1afd727e19675d9aa9a1390220e202ada8

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