Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc661855e5f4d21…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 06:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 10c26461c7e59ce5681e19af40e60df0 SHA-1: ace4a8a4673486320d47031b0e915f3322759097 SHA-256: 9cc661855e5f4d211c8cbab8c0013248f5ded18ee1a9843a28c0a04f91a0fc36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=mexican+lime+crema PDF link annotation
    • http://gocreate.termall.pl/upload/fck/file/62452259769.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0585d3e15d5aa5aabf9851866621ae5a/69090909595.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/gaxuniteja.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/22f58799806bc8940edb3cdbe355c415/gowilinajejubevep.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/87421848023.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/97ltmlojc2dcr8a0dj55vq4uvj/66478268927.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/37648433527.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a1840e3---24759298169.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19fa5516e6557d47a29ca59c1505eb04/xikopiv.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bipejijijuwokalanalowe.pdfIn PDF document text
    • https://noventa.cz/media/files/file/dulejelagukuxosetato.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qq351i7680nb94foodu9lfh3hj/55779600354.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/84893934484.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/sopoveda.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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 10100 bytes
SHA-256: 57a7d99ba562701237a3b9e841cf0c31b096c8b5a14af4cd79e729dc807257a1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 18972 bytes
SHA-256: 6738046672508db738eabd3cc84ebb2bbc0dc2896b78bd9d1a866a23d2ebbba4
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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