Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d92ffb06b339003…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 03:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80ddb805c25a4d2f67af98a1582f4f18 SHA-1: b3182ad1ce324cabe4f2cba0e76bf4b1cfa06df9 SHA-256: 6d92ffb06b33900395635eaaba79a2b4f57428e79912eff688dcca84ae8710be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress sites, suggesting it is part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46f8b08c5---34914446830.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91df99c44---fovew.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/pevuja.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/ditidipemijez.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce5d737644---nifegovomezul.pdfIn PDF document text
    • http://come2menorca.com/images/file/mujitasigikod.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/dafav.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/27052540178.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/zadejog.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/gejab.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630505565.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9fec8f16d7ddcc7ce456d6b0e85a8619/94682027631.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/99080914057.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/kokobekajirowegopepopunu.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/vigulij.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/11911146718.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117fcae9c6---22773278051.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614121c08db1e---mipotivorak.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/tebit.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/pisuwedirupiwizep.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/q71un31qgrsljaehspbfqld4q2/tuxetuz.pdfIn PDF document text
    • https://lordoptika.hu/files/files/34111913651.pdfIn PDF document text
    • http://irinabailey.com/upload/files/pozaxoz.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/12911234966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=messages+disappeared+androidPDF 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_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 10416 bytes
SHA-256: dda500c88fc060042f57fd2355c8a1b1f8a810df01b8000c7151979853b31290
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 16476 bytes
SHA-256: 5ae6db69329d481591b6cdd5ef7c8d60aa3526057808e752345b6193bf12469d

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