Malicious PDF — malware analysis report

Static analysis result for SHA-256 07028f31d0426ebf…

MALICIOUS

PDF

70.7 KB Created: 2021-07-02 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09c3acf487f9efa3da496b7189b9bbbd SHA-1: 344b0720e6dc1821f22a4d81f0d2796127b0a365 SHA-256: 07028f31d0426ebfded6e3d0350018bd371d9197e313fb02b499731beed7c583
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for directing users to malicious sites. Multiple URLs hosted on compromised CMS uploads and disposable domains were extracted, suggesting a link farm designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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://cohensevents.com/clients/74638/File/refivo.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c50dd3ef73ed752dee16b1161e1d19e7/fezuwovomipe.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/xalinezivisuvujunuwabofof.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/wiruxolupogerupow.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/48688442138.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/femexabotekaperezojili.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e73251d1---gekutape.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc42d155a6---kurifowomaxake.pdfIn PDF document text
    • https://sinarwaja.com/account/files/96155090444.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e160cc61---26363108427.pdfIn PDF document text
    • https://irrisyst.eu/files/file/witof.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/7515958240.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef1849f53---bunegolixixepapa.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/2852333712.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1lh7n7b4g5rc60e5fd8s29q462/xogasawinuxifufi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/taxefadutavima.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/033ae2512bbfd8595e710576f90a9d9f/sekebojokowomajogonenotur.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdfIn PDF document text
    • http://e-hane.com/files/44995140960.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/rozagafenileditetotefinum.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f6c8b182---78102373757.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/wuzokowisutabi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f486ed93ac---25010108402.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0ec4eae5---zudemadobovena.pdfIn PDF document text
    • https://everestart.com/images/stories/file/lowebaliwipu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/36aed73888a1ce1b10b8583670adcd44/duvesenixuzejivixenapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=business+reports+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_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 13996 bytes
SHA-256: 41b0bbb822c241bfbc4ab63d04808a2491720aa931d3245dee81fde5d469667c
font_01_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 10436 bytes
SHA-256: 4871ea3c9b9e35b5526a042176ad34cb32abff0842a890addb1ca100e5cde753
font_02_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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