Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e76b161d44ac32…

MALICIOUS

PDF

123.5 KB Created: 2021-08-07 05:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a27cb7185379d40609e9a5d1b719806b SHA-1: 7f0eb7fb4fcc2c37834e313889d0371c1f022429 SHA-256: 97e76b161d44ac32ab1b62e36cb524b1ae84ea57a5ae9fafbbfb589d9386971a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=teoria+del+comportamiento+en+el+liderazgo PDF link annotation
    • http://someteme.com/archivos/_20210710045506.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fd022485f33d6885c6d8623dbc08bee0/nejaxevofo.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/puligixifes.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/027d4b592419f5b3109a87ba162f5b32/bojirajavejopov.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/zilenetewe.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/85964195434.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/27222140736.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9ffmpa42n6oaj90u2gldkrav7n/sigowifa.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vixiluwavaxanasaxaxovid.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/zavevevabitugezo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d913e34df3644d77667a0e9818316857/25177247100.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/74888386561.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/45700371674.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/maxudowagalufozosajam.pdfIn PDF document text
    • https://hgb.se/filer/file/sobuzaxarefodalenomimi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e0c1007a4---44373863226.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a945c6d58d5c33aa7f91c2d6f44b9fa4/45193810984.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/bitejepikovaxuligimodorib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03f3786f2e1f19b83673892d4ae6f01e/39984200329.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/18457241639.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozakewawefikusabusuduze.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c3ea55df952c8fe431ebc504d686e148/64699684574.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lodenabofebidupudumudu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/21569130748.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6ffd74a409e7510db0bb223f15e32733/dimaterebuzesapem.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/luxijijafabunozekolesowe.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://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_off00017d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1D 10712 bytes
SHA-256: 61fde7f04e3d9f02dcf783eaabe277b01834426f59a6ce474e92b781e9e0f75d
font_01_sfnt_off00019577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19577 19280 bytes
SHA-256: cd99820ea83ac6ae4963ea0f7b033ab743dc6a3d7876cb9424c5aee425a63a1f
font_02_sfnt_off0001c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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