Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a825f4bd0fc63e…

MALICIOUS

PDF

79.2 KB Created: 2021-07-07 06:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69336924d9fe60cf99681407a6de6ffd SHA-1: 78b6f3932bea5dada2e3c7046da09acf8bab4d3d SHA-256: 41a825f4bd0fc63e2eac3c2ece47e095f51e99a27de625a0fa48276f7ba18d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan distribution intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=staad+pro+tutorial+pdf PDF link annotation
    • http://przedszkolenisko.pl/userfiles/file/72844311037.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jifegogafefope.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/28083467343.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210526_09470C5C8B40CDDF.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v52urbtgp70pug4cdoh1kp4bh2/fonajusorab.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c08d1b1188e302d9677f30287321479a/49309960839.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a884c463b9---dagumuvivazuripisu.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/wagibibibitaxamonogop.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/43819378606.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c7d12fd2552bd889e017bbd26ca06719/lokosu.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/70196389613.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/sisadek.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad80e5b0e6---64009011284.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/beae4d06245abfb29c4754f227b26d7d/12878512250.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tixutupiri.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/95555350761.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lodidepefewabuk.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52e32da69f32282cd1d978c2d086918f/4144447893.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8167d6261c0c6bbcb1b3e853dd100a67/21855015297.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16081b4b45dec9---56747010985.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc48a246a---rorugofumomewozuzun.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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 16480 bytes
SHA-256: 4c1bd35361e37397b2d7437b1055aa5cef967d45ea662140f225ec8d0e127f49
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10260 bytes
SHA-256: fbed9c72e71722a7ee7a7a0e8d5746f552cc8e8584d44878f2c5bda48340edc1
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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