Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bc0f98e3873565…

MALICIOUS

PDF

82.0 KB Created: 2021-08-07 08:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e16017338b51806a84a07d6a6cf8386f SHA-1: 7237f4e4fc5516e90ad32435b4fddedc3001589c SHA-256: c1bc0f98e3873565c262bb3bb7bb0d6e9a0bed66dac3b4e7b896d8227f5c63d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kayapaliinsaat.net/file/7949104590.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/115905338760a16460e3e09.pdfIn PDF document text
    • https://chptravel.ir/data/file/jozavigizobuzifivik.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/roxopuxanon.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d10bdcb7f---51982460011.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vojejo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/20508613064.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b9ed95ecc15c6700be0877dde3b54e97/mosasemenevowipubovotemem.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/74895572563.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788980ac44---47233618308.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/20470255985.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-25/2107252212560973157g6gv2m6ltwh.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kalofoxesuzipor.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/49aa823b86ab604f63486d4888ff8e9e/41447846537.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/91819137033.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/28984100749.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/bebenir.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/36186511014.pdfIn PDF document text
    • http://anupbolivia.com/images/files/wekirixumunotagupenitelo.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/salimagenitowuwofabedosub.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0d841caa---miguvemazekawutujunoma.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fezebisonaxopipowuwukerav.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610da39d79115---74958543217.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/45990872201.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210708_090704.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/46341287682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ionic+compound+naming+and+writing+formulas+worksheetPDF 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 11296 bytes
SHA-256: 7f0364b7678c2fbf8e75ae425668ab8be0629e26c3c66eb1a692004842b7aa83
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16636 bytes
SHA-256: 19ad968018d2fb2ec1b2cf86516fd16cd9d223d93234fa3e7f8bec6975661bb7
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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