Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c373c66b95c9c4…

MALICIOUS

PDF

67.4 KB Created: 2021-09-15 20:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3bfbec617ddae65ee1a8161650790ad SHA-1: da8923a522d2c127dcfd56bdc0d1baecac7c12c7 SHA-256: 25c373c66b95c9c4baea04b61a30e35e017b906c9c384c36aa5fe33bbf9b228a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of multiple external URIs and a link farm structure points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://ugyvednok.hu/userfiles/file/zulegub.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2942d8d89319e55fceee552a3eb51185/kobomajutifunakojekajokum.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/31619755121.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/18816241347.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/wuxujisojogufinage.pdfIn PDF document text
    • https://tpk-m.ru/files/file/sawepazariwunevibubufufi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906082358345.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78129810010.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/refolijipi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zegonaxilame.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005da8feb8---5697097897.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/22511074121.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631592181.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/16947815478.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134426d8a48f---57747869626.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+apk+originalPDF 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_off0000a70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 16644 bytes
SHA-256: deaeb7ad01c37c25247052e01dd766f653bbd03f1ec7a7faf462135fd1fcccea
font_02_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 10628 bytes
SHA-256: c547956b5e6075e601c3f4dd0970491e136a392f4270eaa839bd40de2dc6c482

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