Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb56a6e9b63a7e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 12:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f375b2bcb3b756f639b65ade7bd61576 SHA-1: fbcdfb206c35915b47ded4dc99e622c7f648f797 SHA-256: 7fdb56a6e9b63a7ed187ee8b38544018114f9c9fd82f62eed38d2eb2bf295637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm on disposable hosting points towards an attempt to redirect users to malicious content.

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22530e46c---39592842761.pdf In PDF document text
    • http://shinies.ru/img/lib/file/12342170465.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dewonekugelitad.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210828012216.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/nalujaxujupazatifugoza.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/fidomuneroraxaseko.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5a817e46---tofirekonuxofugi.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/57766005265.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/814039530.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43e78a223ff37823026df98b6b46200a/24596134944.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pibejuvubeparusalukerov.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/74438669729.pdfIn PDF document text
    • https://kede.org/userfiles/file/80876180323.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/80258787437.pdfIn PDF document text
    • http://robedecreateur.com/img/files/gowomufowugizuvokemo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/bixekupedolagika.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ac55dnqfhj86m881m12d5ba004/gaxepov.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zatodabogox.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/37149327996.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160edfd253c30c---19460803389.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/96702409610.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/768172761386978c1aab963f0754c434/48549832839.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/kalepibejosu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/03155a285ce561f1da9f1f2c539fabe0/19647929265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rise+of+the+tombPDF 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_off0000c474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC474 18316 bytes
SHA-256: f7c3706daeced6d61845f860b78148e828a1a6e5130cf80ca3b12aa18135123c
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10252 bytes
SHA-256: 6fc144714e1216842a00a1b13a89f25649d14f4769b0f8156942ebaac179e400

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