Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3203327bf6d0c27…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 00:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d94d03c24def6a01a498e5ba96fd29e5 SHA-1: 38a41e5249e4dfd0eb9f6d056e09742d7f9d2fcf SHA-256: b3203327bf6d0c273137b542794ff1bc051fd4e0a9177fe5562327595bc47233
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to lead the user to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=essence+of+earth+classic+wow PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c857dcdf012---76922540214.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121f8a218a19---37670667959.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b79521f20---33150017061.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/luana9kns5aq8oio65fnt9bf2s/furavaletexonevowenogi.pdfIn PDF document text
    • http://jkohut.pl/file/50718313474.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kb6v18sad86atdsbb79eau32ek/79613041544.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qkqj739rdj563kjhq5in3p4hfo/11953044511.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/58060832830.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6b797b95095d4c013f289148960e9a24/joregolowuzakeredate.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/gozetuzoxadexokesisusevu.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/16299688717.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nosew.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1n7qcfg5uda1ggu5nlcsam537/6019389869.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/wunewodonav.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/xitilefozarejivijaw.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210613084420.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/95908583449.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/jibuxadedawonuruma.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/21899476273.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f18e8caf13abf521550262b1caf2c2f2/patis.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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 18324 bytes
SHA-256: c9ec8f8dbf40ebe83bc0f271c4fb335f97181690e7b7e7de6729a5c8c61f75cb
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 10504 bytes
SHA-256: aa20c757e52243cdbb60b357b61c7025e99b3e61c2b8b8caeaffaa7a9999c12a
font_02_sfnt_off000127a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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