Malicious PDF — malware analysis report

Static analysis result for SHA-256 b361b76060580d66…

MALICIOUS

PDF

90.0 KB Created: 2021-05-29 02:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 944634502042eeeb98740b49e495bff6 SHA-1: f984826c1c5d375b151e8e76c2a03dbacde51ef2 SHA-256: b361b76060580d663b9d10a664d186688e815c9163a34b741e945c74fa8f3559
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites, likely serving as a link farm for SEO poisoning or to host further malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, potentially using tools like Wget to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d8def95f33eb5aa5779e128462fb20af/vikunuritajixev.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/11cd39db2f5d9aeade2f31e3bab9c484/45316045836.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d9e857a---88798172335.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/23795918106.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ttah9uh53e3icvknm3knjq10mt/watoxewimalanazamegosibi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838fedbf064---novibiloxolobajunal.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa334dbb2---garawizigijorobilume.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39885353285.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6330c524c2---82695975108.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/10824366932.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jmrct03nkg75glr2e9b3s6c875/39100690565.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/86c0bc0cedd5515ccb0d53b619d0052f/vibiwuk.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8fb65d1e---tilowi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ec9a0e9a---dabokabafiwij.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d84c7d238c3e30eb9e64188121a21e24/nujedazefejikes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ubuntu+server+install+pdftkPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000122ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x122AC 22504 bytes
SHA-256: cf044b1c41060ce6614ab68ece774cb566cdea744f794fd4d27ea46cb13c38ff
font_00_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5064 bytes
SHA-256: ce9fc6970bb664b4d7d092b71b93513994c57d47d6f5a10b57481548fe9c4797
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 11964 bytes
SHA-256: 42f13ead4705e180d2cfc7b6d6cd3ab628a8f2c5d177616023b48c594d05e99d
font_03_sfnt_off00014a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A38 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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