Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b1f5ac59e8d204…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 13:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05972ef958d3c250b0c89499b8d567b1 SHA-1: 6abd7fd9ecddf3a263c784bc7e748c0ec1adaf72 SHA-256: 16b1f5ac59e8d2045c0402eb6ab73769b0a017069057cedead4702043e1e4b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of numerous external links and the nature of the heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ff69c43e119927411ad08fb9eabe8a32/22015697157.pdf In PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/rulavasegububuviji.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/wavujusovaboxodetofumilu.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/vorijetemosifadesoded.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/ludelik.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161389825a2252---22988931342.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tejadogadizeramebipinu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/95008680958.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/19510079975.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/8117563222.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/80462347982.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903011840.pdfIn PDF document text
    • https://ever-progress.com/upload/files/3061151562.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/14698812548.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/nokebulevosesuzaka.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94737400493.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bupev.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/29019855506.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/86984201449.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2ddkjs1amhrp7ftnalishads1/38046203312.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/tijixonopubo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/ligadamaxagovixelefi.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/dajomusinunumivokal.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fexoturizoperulat.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_C7F44DA28AEB7257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=play+store+rpg+gamesPDF 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_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 10516 bytes
SHA-256: 584c327dec4789c3b33b1f19a939386e5751e8b4dbb9fe65f85827ab50f0ba0d
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 17812 bytes
SHA-256: 68a2efae542808f7ec8a01916ed59ebd87af49ab4535c69985961be1eaa4384d
font_02_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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