Malicious PDF — malware analysis report

Static analysis result for SHA-256 342d33916aa6b75a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-30 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eca9e2a5378ce9bb758511f7cb41699 SHA-1: f3211a7ae7df3a61aa38fecadba4b1599a496313 SHA-256: 342d33916aa6b75a49956ebe1c3cd7a69a8acdca9b0c1e9bd8c9d4b5bd10e684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=the+name+of+the+horse+in+toy+story PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdfe1f164---boporubigu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6b4507e5d0df167d3900d8fd9ff38da7/dizukipetol.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/zebevenebazujo.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/galepu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/11d481e0d4817f6d1e307f8b5918f68e/xisivibobatedugul.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31239b1a0a1d5ff1fa7a64d1a638669b/18651943779.pdfIn PDF document text
    • https://silga.ca/userfiles/file/xupitodutadus.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/boxutumumixurivupasoru.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tefonu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/60875849159.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a684cd336c---68971304719.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/88707725194.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c536e139814---vanurofasadikasob.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/31335136710.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/765f34aaf9cd702ac4887512b55d192b/zotigupajikeriwiv.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/37e8001ff65d66ba8be1d8f4cf970b84/44814442038.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/40567272208.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4de7295f---34976922448.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/67850885686.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zavadopefazunebad.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/30kd6fencs9enegnv2218g96ot/nixunebafujofagewubunok.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pozawonimuzifelojepivabow.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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10508 bytes
SHA-256: 1f76ba9cc6a575f4ca2c8084c307e1d33be46541e331e491b73f96e8c699b927
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 17480 bytes
SHA-256: 265665eef00da0aa41766c206a31fb1a8d69909928bb7177554439972e02af60

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