Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3db677a211de312…

MALICIOUS

PDF

118.5 KB Created: 2021-06-28 02:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec11fb553829b62462a9dbe93cda4263 SHA-1: 50a224db94be2ac614b1a10ee49cfcc3dd4972bf SHA-256: b3db677a211de31299d349122e89c5450184890a1c85c935a0ef423e81f7df9e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://grandinhr.eu/images/user/file/79625022219.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a720dad4b8---31390857478.pdfIn PDF document text
    • http://babamoleskine.com/files/file/48009835532.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9429579e7f5bd807ecb42ea9773d91db/gojikavepo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/47c25ca77e38cdd186e29758b3f5464e/29014763184.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/42271971615.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fudue6a7o7mqfoai4d0c49d6u2/tagidipalopuxasanaxik.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5b1d12445b00d58c2828bb2b75fda15f/banekuwilulawasaxe.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gewogutegezajisogowev.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/xidufibepeg.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/83978956854.pdfIn PDF document text
    • http://learningkey.org/userfiles/35089017031.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/pubusisemuvojuwoke.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/krr9e821uhlfmb84nviupj32g1/sopitenisa.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/823bd4bee45fad2c10e656d368347e8a/nomefakupomorumos.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad22af0d0---moluginimosunebumuvononu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071c906b0948---50718012966.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/wiruwen.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095408ea5431---gupozutalinu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l8hhb99tj46r7cshfi1n9nuarp/9582290178.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/48e0d4612eb93f08ccc53371ced159f5/12207277491.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c3117d9ae38772796582a39860a65e55/mofas.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/te8ibvsgjpo0bk425en2pjgpfd/kagibejul.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/97678589457.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfac03ff1---30520274592.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bebawunus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=images+of+piccolo+from+dragon+ball+zPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0e271ea0687afd7c4cbae2a88a76e0b6/dukufeteniz.pdfIn PDF document text
    • 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_off00013f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F81 11016 bytes
SHA-256: f66c914ac2acd776ea2a232800ee9dd0517f982cffec8de7eb5dffac4e2aa82d
font_01_sfnt_off000158a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B7 18060 bytes
SHA-256: 0f576c3a51ae9e0ceded9983d3d3fe95b591fcce5491fe7b5edbc24a13658d1e
font_03_sfnt_off00019f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F9A 14176 bytes
SHA-256: cb0b28c8f350a1a09c4be6002725a03b36ccc6537cde0c30637a2bba4924fcda

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