Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16a70a932f85bdf…

MALICIOUS

PDF

98.8 KB Created: 2021-09-05 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f01c8b1b68ef81663bb7fb899fe05843 SHA-1: dc3a2c2d8562968385914861098eab7d804d1e64 SHA-256: a16a70a932f85bdf156bb717fd13357303b1b5f4aff96b840c04f6f5adf07878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://liebherr-tr.com/userfiles/file/bopenavip.pdf In PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/89439636259.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/i4k1upvpsmiba46h8gkvacgsmi/87639605882.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/10406713066.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cf29702678a6b861de5e244026bfba7d/zadeladowarumij.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0e5668c7c809b67139d986cb66293fee/72113264866.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/valipo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a556ac81b---vutuzutiz.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tikasewogotavasog.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/lukowowojupuzabud.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/77473396396.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/buluketupep.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc7ee86167---dunodamez.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe89b4bb72---65443959611.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27018d2f9b---vefatezadipexisejo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210714_001231.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/9217509992.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6d773aa0---tiruw.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/61301894894.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pozurutukubenibexedofe.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/1157072868.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeduxexa.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/tupunizanakarapixev.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/xemepirerijow.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f5024064---67470531833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lead+guitar+scales+chart+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_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 18268 bytes
SHA-256: 00c47790f77c2cba5f6fa6faee7550f841fa39fea869b1a5e02a6266417fe639
font_01_sfnt_off00014cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16506 10732 bytes
SHA-256: 9fd7aef39a16d02cfbf15a50af82998345e5ec665c52ddfc24ab703fdb9aec3a

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