Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17b205c20e59536…

MALICIOUS

PDF

85.3 KB Created: 2021-07-26 19:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b01626ad29663d2948bdd58f4fdd8cda SHA-1: d671ebecb6e5e4b4fe263087c26ad10673106d14 SHA-256: c17b205c20e59536a237bb1cb04f7a7d38f0309d9a712da0c91a6d820e13e039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations or hosted on disposable domains. This suggests the primary purpose is to act as a link farm, potentially for SEO manipulation or to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.northern-japan.com/image/upload/File/92817824367.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/f0m4qn0knuvvpagf6khg1st5pl/48699185342.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/konujabidawesunu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c91d4c9---kokaw.pdfIn PDF document text
    • http://ozari-ua.com/files/file/76035932087.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/39vk739qmqgfqq8odtbjjtsgk1/tujanajupana.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/57703260592.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc6543f214---zusidosuw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160772bfa46ee4---bujijikadapexafox.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/19124427119.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6316b3169007641c1ea91ad152af40b8/14917339192.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0a78f591---74854699771.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/jipupovujovuzudimutadug.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b953f1e1---3471098838.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/fuvunalufowi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4dc80719---xexog.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160940a52795bb---kujipexubalaxi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/winifuxa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8e6d2de48a8b3e581f352332434e784e/zaterifevuneri.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7hg25ll829clqk22fk790rmkk7/83326394477.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/rapiver.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/29417535387.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/litebixufumifunutarogef.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceedaa35e---89130458289.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/zegamametixi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///70389212817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=baixar+livro+mentes+perigosas+pdf+gratisPDF 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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 18908 bytes
SHA-256: 0a29143fe4e6af98c5d116fc2088e27631bd48ac044d291cd3905ea8c20d83a3
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 11060 bytes
SHA-256: d22b09310a8480223365332ac7a0831ea5e6f2ff278aab8519ec596eceeef862

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