Malicious PDF — malware analysis report

Static analysis result for SHA-256 056976573aff45fd…

MALICIOUS

PDF

97.9 KB Created: 2021-08-18 05:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2466760eb26ee9c28058df9c5e1e8946 SHA-1: aa8b0a8f36652161de8ec9a386b514116a4460cb SHA-256: 056976573aff45fd2faf46bc467010e7a6c7825325fcf9f6cbceed3bcf55fd27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farms suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://whkmradio.com/userfiles/file/78905145319.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52704359987.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160919687edec4---86914205100.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zapekimenepasoninupi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gofalawokenidov.pdfIn PDF document text
    • https://bachson.net/upload/file/90911716839.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb106ba1b---1689753000.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/54701805595.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bacebf8048111d1078aba98e8cb4f238/15278524104.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bozovapazoberazigonanope.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/virekikorikudu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0287e2d58417ff474f9ddb9bc231820f/zevekovux.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vugivasoximumewefonexor.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/15e6f9bdc7fbc90a003ae6576fb7547b/29823392180.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc678b8ce---jufogazifebakixatof.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a96970aae98---53649152783.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/np2srlq7reeqm73pf6r8squh1j/tekisumona.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42fa5d111---namekakasasamudep.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210708054756.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/56f7596313f095fa2cad625b2e5db0e4/8846442967.pdfIn PDF document text
    • http://www.celso.org/download/sogujitujas.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4a6994eba94140a86b8ff28eb82b004d/23920163776.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/5368507392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=volkswagen+golf+2009+owners+manual+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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 11308 bytes
SHA-256: 1841ea221b82f24b14305bb2e3338c61b6a568a8dcc7086afdbd1fd9f5d940ac
font_01_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 17116 bytes
SHA-256: 9b44873eb6dcdd99d593fe3886aaca8106a191f5c8a4b57f88ed5c5597d43b1c
font_02_sfnt_off00015eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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