Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f3f02b212e2d31…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 22:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f1653386677e4f9134f5373246ce0fa SHA-1: 436bb73f5405a8c179495c589be836707b66427a SHA-256: 54f3f02b212e2d317c13eb15c0d84b984b73e1df9292899e60568a586cf72daa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=differentiation+of+log+e+power+x PDF link annotation
    • http://kayapalinakliyat.com/file/12416918089.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/6499119184.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dmt92c04fvnn03re7bk3fofdga/kelatimatutoguzetore.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/62825058452.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/85144615878.pdfIn PDF document text
    • https://msiutilities.net/documents/wupelanoxuregidape.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/90600844950.pdfIn PDF document text
    • https://europartner2.pl/uploads/refotodebonidekegitub.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/60337796997.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/68331939505.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141459a425f7---pawejekanejategewojefa.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/39088194201.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ced47bd93---fiviboxaxagutafoxiwo.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/29695777672.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/widuxafu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/55957848946.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/44730048268.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/59331706939.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/tivovozujulodaju.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/82582548747.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/14585648617.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/85970861678.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/pupekufidano.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210916015214.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/wozanatorisigopopiveji.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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 16872 bytes
SHA-256: 171118d5cf7595062583b537e7c351eb07555d6b1e5bb0dab20a8a4b5072334b
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10556 bytes
SHA-256: d0c43f9e180c972cd4ca7df012bfc47a4df481e364fd3ce4b2ef6ba8a3344770
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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