Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf386e080afa6711…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 18:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 472343d9618db65fa453b618321aa10f SHA-1: 09e1c9a092bd24f9f002a5ba6185764c4724477c SHA-256: bf386e080afa671118be001ba29296c6e752b4b208193c60cae4e0ea505d915e
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs suggest the primary goal is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://techscreening.com/userfiles/files/24881669093.pdf In PDF document text
    • https://neplatnasmlouva.cz/soubory/bipunawe.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062811223670554.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a431d7614eb---wevedaxoxevegasugomekiz.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/93045b649fa5205bea62289a662d843d/45989127002.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4su6n6obue4u3rv04ht7a3tgr0/xogakezofo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/61bdb3f42cf584c52346677bad2a4f61/73114520984.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/tazexurujolivuxarij.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8d525dd2560204f73d9b7dfb3a0ac931/63028898004.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfedfed533---84102240858.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/rasularafejaviluvevileno.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/1111714395.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8jq26f7oj6htoggtqckkfb8t90/52779024722.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249e871798---9179897282.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160718bfde1314---vamerawasiwugo.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/nadivofudoj.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1ade543a3295e1e2b69756e9e86cdf5f/nekojexubafazizupuves.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/46322953875.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s87me3k5rs41ejrg9pdrstcli0/40267357183.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3d1d2d08f5d6bd1ba398107783aa3581/50096990339.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fb6397dc7373e807835ddf123d725f1/61809507416.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210524090237.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609563233075d---wedoropeluzezuvirox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sentences+in+the+past+simplePDF 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_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10496 bytes
SHA-256: f8b5d0db3e2c762c45148c9b32e001ab985246d78e4446d13941a0545382b9c0
font_01_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 17644 bytes
SHA-256: 68dc4dc1ecf77daf41cc6e0ab5d11b6606ab465356d510ae770918c25dd05af6
font_02_sfnt_off00015a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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