Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ace4d18bf68b79…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 06:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 676591b26a75568924e8186d6dd50a59 SHA-1: d6489993f6e1589d420ee0842527d356fad54af4 SHA-256: d3ace4d18bf68b797495f30c15ff2a7dbae648b512b7ef2e879e843a4df57abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to obscure its true destination. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dawahcity.com/userfiles/file/65017902652.pdf In PDF document text
    • https://rizecanreklam.com/images/file/vurunexebujigileb.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/xorixenevesu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/84711751525.pdfIn PDF document text
    • http://deforma.it/userfiles/files/92861849847.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630808041.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/keponibu.pdfIn PDF document text
    • https://morabia.fi/images/file/47269199549.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/sodiwata.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437e778caec---51364028143.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/suwuliranugaxuxagug.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8248d7b0982def87352aa4c9ddd09737/41529859061.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/luwewej.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/84979791515.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/32288031878.pdfIn PDF document text
    • http://umhouses.com/uploads/files/10048773470.pdfIn PDF document text
    • https://nomortiga.com/contents/files/nevifesuvimizo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613305ec39975---lubegide.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/90384740869.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/mivedafakedupofujaz.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910132458.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/nokixaralefazator.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/00aa92ae166951e64a56078f1164cbeb/50349391565.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94927c5b9---97014763179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+football+streaming+sitesPDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10752 bytes
SHA-256: 0975c2e1db29ed4bcf327cc76f52a8cec825bc2fdf62c0993965b77578b9d285
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 17200 bytes
SHA-256: 74b1259c776cdfc600ea7c8079e2c09e8c77a4d4a5271a33f035d024121520f7
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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