Malicious PDF — malware analysis report

Static analysis result for SHA-256 526084132f5fe20d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 08:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8c8a6b6a94053ce492c211ef5d05016 SHA-1: 756a7402b3ba32651446dee9be8929a98d2bf5ce SHA-256: 526084132f5fe20d942d3a294cc0d1c96d90afc3c50b56141cd54e1f0578df8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and clickable actions. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ajtoablakcentrum.com/_user/file/3358869052.pdf In PDF document text
    • http://fructusartis.com/i/File/78989006421.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624224904.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xurukudonudewopilot.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2c23f2cab280722359017614d048b5b6/fisejinusaluzelabere.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3a179b732274e6693b3d4c46eca18d15/boroxugogowadiz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a43e9169---32140539334.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/358fd7d2c7af4a58bcd80ec0d6a068a3/bofuguzolepobititi.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/tujib.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a6277c1f5---bakorira.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/14881530138.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/009316bd915694ded698d32c253a39d9/kegegosino.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21c4a24c8---kawuk.pdfIn PDF document text
    • https://dm288.rs/slicice/file/45812996523.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n8f20v5ksjq20mv5938ufh8mmk/25877467909.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160707238c6ca0---jetedoxivolove.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/badiladalipagijiti.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ed0885cd---68997011497.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/mufevaxa.pdfIn PDF document text
    • http://kalikraft.com/images/file/takubogirebojin.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/169a0053e30813bfd63555df2dbc6212/molopamofuvimigite.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/52475371488.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160932d7857f6b---96914301676.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sanofizoxumaxu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jitabitugipewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=post+translational+modification+pdf+downloadPDF 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_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 14068 bytes
SHA-256: b9d5784ad7deca4b5db3fbc003ce994b14ced391b22372bfeea030b0e8a54d3c
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10736 bytes
SHA-256: d76f3f61be0cd51143c18e09944f84ad88bbd66dfb3d6b05f1c6182c6e5d8596
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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