Malicious PDF — malware analysis report

Static analysis result for SHA-256 40150fddad93bf13…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 21:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc34a812a7f63b30859893c73d7f864c SHA-1: 622408c03fc26d206c20226e3d8ef8021b822424 SHA-256: 40150fddad93bf13632b64af27c3b461b64895b59b2ddb6a1beebe0eaa9911dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://afghansolar.com/userfiles/file/xuzidikuvabulupe.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zezebedewamibuduma.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zonatiravu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877593433cd.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/54371417112.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/47849585454.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612102ebd210a---2322264060.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jasuparupumulakatek.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kugizaxilapadatixe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/47608563600.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db578ecc10---16273380765.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilive.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160944768817d4---47479400974.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078f845b8821---94771650982.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/rapenewube.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb399ac1988f7ee338cba9822dafe834/satumotapo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/daxajoto.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/39782058637.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mekumolejudifu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160790299f0dab---bewafuzivuwologakuninafix.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63339201950.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c4icih7n7i4t44prk55re36r70/98275731590.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/fudagogugud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+excel+file+to+pdf+i+love+pdfPDF 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 17852 bytes
SHA-256: 0a7b6870568abcad519a9f3e77e4d84b17a4600da0c5b779085eaa730f16c388
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 10484 bytes
SHA-256: afb98029e0ad86c0d044da48b81633817f798b7c14f0c8f4a4bd83c82954b750

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