Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa574d999116202b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 06:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbc360fa016a72d000d84c940a7c1827 SHA-1: db10c3f6a9225baf98205b5d72c1e2247586cc4d SHA-256: fa574d999116202be985c2533ce19afa2662b044273713d21a89a01ae1bd6f35
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and URL patterns indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://loffoxfitness.mvwebsolution.com/userfiles/files/xagewuxovuwivebifised.pdf In PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/jidajewe.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/xikujevuda.pdfIn PDF document text
    • http://seamacros.com/upload/file/79375108100.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/95626701516.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7187db7---94806488381.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fipimonupifereraxuzow.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/8308733847.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9f9c176f---xufolas.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/norosolufekawulurulesize.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/53520793533.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/limuz.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/togavibega.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3686427afbbe050de82b0071546cc2d0/jejosoxejenavose.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/14510049752.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/sewiwufokobo.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/90417759084.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210903062533.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/gumitevusaxemakivatanu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3o1que9tm6531se5hha5cqn0li/45290028671.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/41858128801.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/badimamibe.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/68992500156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=come+creare+un+app+android+gratisPDF 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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 14612 bytes
SHA-256: 5e3a808dd10ae02cef8402b5ebef6a1c11580cf5ffee11540b1a547cd5bac7ef
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 10940 bytes
SHA-256: 662c2bca53f94abc9406020a64d35a1c959b9f102b4e6fdb651c5733060a8297
font_02_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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