Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f2fddd6dee7ccb…

MALICIOUS

PDF

95.0 KB Created: 2021-09-17 04:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b100916fbc8d673b59a6cfcdce60620 SHA-1: 458364ff9bf98b129b9fad6ee128ade5cf41da5b SHA-256: 93f2fddd6dee7ccbf3eba8e3684f80b571d3ca227179bb9e416779264c510041
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://drafthe.ru/uplcv?utm_term=android+dpi+calculator PDF link annotation
    • http://gocchame.vn/app/webroot/img/uploads/files/tobivovenuzugedulenamu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wematetuvoxoniwirog.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/59019396807.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/99450788176.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/39502304267.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/36321756433.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/ginepuv.pdfIn PDF document text
    • https://fobh.net/userfiles/files/felewapagakituza.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/dipirabateboluva.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/ledogasevoxova.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/niladodipo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/bumenamusimepugikik.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3a90179bc48f8d92eb8ac516ff3553eb/17663768800.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/92f8f493e03688dde1b70cd899a8354d/xemadezujapejup.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/78271845097.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/finefawexik.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fijis.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417feae7fd1---81049105246.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fimiwebava.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sevajusuxelewowusaxapipul.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6dc7f3f5---nekimexoruru.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653c76e1f6---96177878248.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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 22028 bytes
SHA-256: 581f8f5e65bfafc84496a1fb8375aeb8de99b1bc150bed76839bb177b507d318
font_01_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 10288 bytes
SHA-256: 7411f9a96631c27ac19a5f2e62269422dcd3c9d38e846740fb25c9a96c55dd3a
font_02_sfnt_off00015613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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