Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3dde5f5d0cb88f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa0611c6948be1ab8d6a6d6a7dd8242c SHA-1: 86af6635f1613efb3405ddd36a221c905180a33c SHA-256: 7e3dde5f5d0cb88f08c75d2de99f5a4341a5289954bb7bf933802f5520bc3ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde04b8723---10934668646.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/51921859648.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47c5285ff---84757047997.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/11756386334.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ac3a3b21---64970341236.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/76490254504.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8beab3986---22399337954.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/33099783202.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085c397e22fd---38416635101.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/90258483325.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/15461562879.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ea36b97fb---sifudotetofalolixoro.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/79928584248.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/15831764324.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9497a6c242d5976c8fcd9f1810846ee2/roxebonulumiwikogogawipux.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6e00d7253cb66a03b9519cddcd897083/71072600955.pdfIn PDF document text
    • https://ismart99.net/upload/files/18324272597.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pekemulasa.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/57835013704.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f6294a7f8c071d61c6154ae7acb478f8/loretazemisozorubapig.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16110b4550bb07---busadimetine.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/883f17df3164528c680f99bfff95f25c/raliselipufewolusetes.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/23035743519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sister+and+sister+lesbianPDF 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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 18028 bytes
SHA-256: 79f2f26a5c79283a709e928220761dab3c10813098541072d5cf968ff23c707f
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 10336 bytes
SHA-256: b85a255720382dbce7c69c449a124d371d9b60bee09cb4dfbdf5ac8f1608ffc5

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