Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbfb4688fdb01a0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58619534cd0fe8609aa639c57a36dc9f SHA-1: 89f2dc14eba81663858e4ac1d8712688741428f5 SHA-256: ccbfb4688fdb01a016ccd21e8328793b630b3ea7eb3f1679f0192b61f94b7795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9855bef100c4a3dc9c624ccb5e9caf06/juburek.pdf In PDF document text
    • https://slezanie.eu/userfiles/file/jaxivazizedolozaxevun.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/85377783159.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xamen.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/68746217093.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/namadusej.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/66933286307.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4a8fdpt6h1vgfslndr8kfons66/26562471124.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/62916181562.pdfIn PDF document text
    • http://vitrine-prof.com/files/niboke.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/jerumorokejekejamiwuboj.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/64400941905.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/waxasufasepumunijoluso.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/tiwud.pdfIn PDF document text
    • https://interconformity.ro/images/file/lolozilinok.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g4rrd19t77mcvmcoteou0rp9cg/tidalo.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/34478557545.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/mubinuxogimu.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/27886776049.pdfIn PDF document text
    • http://ukrfirework.com/images/file/gemutu.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/69870392693.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/lawujubozikuvosoxuxedexu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd65d375f8---fufapad.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc08bdaa8---75069217173.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/rejisojidoxozoti.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/18125458184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+speed+up+utorrent+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_off0000ba7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 15328 bytes
SHA-256: 43928e8736161c460b0909db0fc7b09d3b5aae8005668d3befba64dfd5346a1b
font_01_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10516 bytes
SHA-256: a06b07ae167cd6566a5f64ca6689a7a51bd82319bd6dd1035082801f289be2b3
font_02_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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