Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7b739c9cf7ec3d…

MALICIOUS

PDF

82.2 KB Created: 2021-07-13 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfee2b24e08edbcb87799eab2dfe0d3b SHA-1: 180434f091c6d103db3c414c31df92b4d828e2cd SHA-256: fa7b739c9cf7ec3d5d4f4c8f3564fb1a6f1f3b7492597de3a2d697e4c294cc87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick the user into clicking malicious links. Several heuristics indicate the presence of link farms hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://aawyx.com/sites/default/imageuser/file/19886798842.pdf In PDF document text
    • http://twxcd.com/img-aim/files/wodelanakemobujupol.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xibuvomexogovotev.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43895bc2ea---20885301242.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/87a75515545c505631b2e9f96f669695/8885484573.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ffe765e4---16840772107.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9626ddf3e0---46104730516.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7efd4c7d65c9c1fa50fc5c67140f1eb1/gixomibivepojolubadusodo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5b3047b966e8691c53148180aace1be2/zilunenemuvuvuv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sedorekelesu.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/33294173497.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/53148038154.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nowaxakafekuvawime.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/wizakixezavavuxetejim.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/merozevi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d721c55aa9---bifinitinabu.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/14197482855.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/45252856766.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a208f8a244b---gonoreneputazugupufuvav.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/29891372102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+work+secret+conversations+on+messengerPDF 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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10760 bytes
SHA-256: be6049c5f91b8547a13311e71953787b9daf7d0f797d1277c2f1a285e30a368f
font_02_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 16916 bytes
SHA-256: 355913e5c22a91cf0fbbc476f34ea424f510d526f9f2b8b585d329cf4f9a5919

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