Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f3f42f2c1dae33…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 03:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1be5379c99f67f65687c8dcbf2701e71 SHA-1: 1a434b86d81834ff04cfd7f8ab142db5c58e180b SHA-256: 98f3f42f2c1dae33328cee7d21f24a22f4c9b8a37b2e68a04f3b0c7ee69c442e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised websites and disposable hosting. The presence of multiple PDF link farm rules suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=instasquare+photo+editor+mod+apk+download PDF link annotation
    • http://yilip.net/userData/board/file/biguzajozixatafa.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fidojuxujonubijov.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/wujip.pdfIn PDF document text
    • http://bakoca.hu/files/file/43104145597.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/50592187893.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/rimitekirofefewageliwon.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37413552875.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jonakukaxuj.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/23174358350.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343b7492ac2---bozanezodar.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0c79244fba37b2ef91a540c9620915c/kuwibewubovaloba.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/55031525564.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/taramodobej.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pasumabawalezawovoroga.pdfIn PDF document text
    • https://t2sc.me/userfiles/14174218056.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/55895441995.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/gadoropagizena.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/lafalemamirorafitegobip.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xiwuto.pdfIn PDF document text
    • http://vinmexindia.com/uploads/botiwifixegep.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/49774695217.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e96c8a6d8---19418772022.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397feba962b---73986728632.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/68153214474.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 11032 bytes
SHA-256: 7f423dcd405fbfb591c10b5c9549f43b4d76fe9ced0118b01531244ebb7669fd
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16896 bytes
SHA-256: 533a09a2a3b0847e83f78a040452f87115c7dcf2e46f84dc86ff11437f0e489f

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