Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e86b644320315a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 04:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6aec616eeeaf241a89c1ec38503cfcd SHA-1: 5e26462fb34bdcc8fa548f40644f48577ca2aae2 SHA-256: 50e86b644320315aad12203fdcade0182639cd7712696b226bf5c663c1d72124
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or distributing further malware. The presence of PDF-specific heuristics related to URI and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://maskaevlawyer.ru/userfiles/file/19210546282.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f27u4e3s4bjavqfd8hns8e8o04/jawurenubexifaxerit.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/rawulepuwezori.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/63295307100.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/15756878279.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/74731285602.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a984f2e716c---xezugesim.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kjfmec23jr54pk1655num570m3/43911542194.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dipcupoljm8ks7bj7gao75ijgd/81047100292.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c5fd9b09---sikodoremizilugemum.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2084fff3f0790cf1023916edd8a1957f/nimumal.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/puvotirebe.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/konulisefasonexadu.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/taxunofolafebexana.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/26363565480.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/86434317065.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb844bc656---vonenigivef.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1bd9926232dd95cee1fb89460f8e0f5/75948381273.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/zokebowebimapiva.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/xugipufem.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/95d4261fa80cf571f2c79d45955dabad/18574187008.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/51745018603.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hj8fe0mags66ubul1nv47i9hm2/mipuvelefamuxopiwofevasal.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/51490552422.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/67522167886.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/83999326056.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16097190d05971---ligisigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=descripcion+del+hueso+temporal+pdfPDF 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 10984 bytes
SHA-256: 739e94d250180a0b8a2c3bcabab239968168321616b9c1b27513c06a25208e69
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 21004 bytes
SHA-256: 037c920505684c651e506c994e1e738d77b1a31a6695d665b01aad76e225c5a3
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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