Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fa8fc817303250…

MALICIOUS

PDF

131.8 KB Created: 2021-08-08 19:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6b0309c7a134c0f0771d784b234768e9 SHA-1: bfd3caac20f9fad27070bc804ccb1de548b902bc SHA-256: 60fa8fc81730325077337198bb7d3eb94d8899f681ef6031f4cbeb3f06de3d63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the true destination. Heuristics indicate these links are used to host or redirect to malicious content, consistent with a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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://jyjjapan.jp/files/ckeditor/files/17944059000.pdf In PDF document text
    • http://sillajen.com/fckeditor/_upload/file/99610947845.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/92e536f9307a9878e501d99521196b28/72805730916.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160898330ddabe---gutepomutu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kogaj.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984703207c1---26183198.pdfIn PDF document text
    • https://area5srl.it/file/mibun.pdfIn PDF document text
    • https://bnovum.hu/downloads/33999455482.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5210e00a5---75575057302.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608329511c7fd---51797788481.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d8e0c54da---91258466434.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90eceaa93---bixiwotagosewara.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kh2mqo1edeo03u5pe7gkq085oh/sunuguwezokipofowemawij.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/xopezonema.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/zabeloporinobular.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9f58a29f5d874c6f4eb5ee6f53b91ce0/39880310389.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4ci6s6d8ajgn3orjtpgikc6qoq/7316133387.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p18noau211e2et9bqtdv6lt1fh/mazamo.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vc0btf0c3u9q6he2p6tncupqgh/muwazalotuzaduvoze.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5e2ef1783ae6547d71a11c39e372eb24/50687603208.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a8a93ca654bfa18c87ce9160c9f7201a.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0pd990j1hqnh31n8d74i6em5b2/fopixamidab.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/60019042396.pdfIn PDF document text
    • https://digireg.org/upload/ranebi.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/kemepexikedefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+advanced+learner%27s+dictionary+%289th+edition%29+with+iwriter+%26+ispeaker+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFD 20592 bytes
SHA-256: 0aacc1167c22be6f7d8fbc90c8e0fec656ecfb6dfb46eae341bde3396cebfa9a
font_01_sfnt_off0001918a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1918A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A1 11324 bytes
SHA-256: 3da5aeaf81684ebf4b6554ff2505dddffb699b5fcd05270636e93f9d9f5c23d3
font_03_sfnt_off0001c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C472 19880 bytes
SHA-256: 11485dd98f7d408b87f4e79f8b68fb998691caa4cd1cce524b578c84549a4653

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