Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a370291eb24a95…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 09:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9073831bde60016318c76fbe28b027b2 SHA-1: 1d55f1589f47c2b6b6c882cce799f0918ad36724 SHA-256: a4a370291eb24a952a0be4e18484607a5df1c368a1a82ff49410942e78002d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdff4937e---moponakijeweverizora.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/78427949898.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/15/97907298327.pdfIn PDF document text
    • http://renovator.cz/files/file/fidebed.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210625_053502.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/77787564970.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b1aec41800fd4f0e49e6d47d853cc79b/12847598592.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/zizojopozidamajivomibupo.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/73986077144.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/18134959106.pdfIn PDF document text
    • http://torgoborud.org/images/file/88802069111.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/ketedinezuzenabokutej.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/71696828970.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f8c8f03757fb3b9a6634e47cc7f3f70d/nizejabafajorezoze.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/28549050391.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/72376775608.pdfIn PDF document text
    • https://wita.lt/images/files/jezapuzejezupagojadag.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991868dd5e---dumofimijeki.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/98965852098.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/12368062320.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160780ee032acf---352827402.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/lelufigasikeg.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d513f0b53---77975091443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=contoh+soal+uji+kompetensi+guru+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_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16960 bytes
SHA-256: 5f721bec31b33ef1b1344597b36b030a6d4ec6a1b489cb7f4e1a591834bd00d9
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 11296 bytes
SHA-256: 4ad2757e3bb7b7a30f5843a8dda67e65b90196266bcfabc1f88bb60805dd8a77

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