Malicious PDF — malware analysis report

Static analysis result for SHA-256 498b22136269ef0a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 04:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 382dc40d6f86d52d8f1f1985b306b470 SHA-1: 276a9539c4541172d86c74e8209305d70779d7be SHA-256: 498b22136269ef0a348915c5fa6794edcc2dcb7ddcf9c05a099f72ccc22f04ba
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8293

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

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