Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd58aa9c8c92c28…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 04:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35c2ccbd19611333674f7104be37d461 SHA-1: 00f9dfcf2a3c5d9d947c84bcfdd6b8f194c881e1 SHA-256: 7fd58aa9c8c92c2875c57082b5caa57260dfb8aa2b755a1f24b2760df2526e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0d9ac503---13958895828.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/56565619581.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fjtu6ihlgktrl0oiojidrk22cr/jozomibamubawaluxuresute.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gufekexigasewap.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/62b3784a51913e139dbc6d63a2761e54/93713479868.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/kimevemisimumejemewep.pdfIn PDF document text
    • https://ancoraeducacion.com/images/78512919800.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7ecb26472c3ca5baa68cd1fb64b45359/tedagisijelo.pdfIn PDF document text
    • http://healthywithhart.com/res/file/1020255333.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2476b547feb5e417cba3d12768e3251a/lolatolasapivelawovisad.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/mivazolibulukituso.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a4b60nlp9pcihb0elhkm6qggd7/vozifimukafuf.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/49016637611.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2588946a---valulelobibivisebiwewi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/1079713287.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zenifivawota.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aba515df7a3---kitumoxudapomufibepeluxe.pdfIn PDF document text
    • http://northcity.rs/slike/files/wotoxomi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/toseletowegerokider.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/69164607435.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/85236326469.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/sasuvalolajosudobisix.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/sevawawugapadopoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=real+life+minecraft+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10600 bytes
SHA-256: cf612bd1b1bc68226a72c014be010e978e1c05b73b0ae7421874b8d91623dc2a
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16776 bytes
SHA-256: 4bb0ecda4395cc9a0dfec39652530796d54ddab3768fbb0088ed94d4f24aeb08
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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