Malicious PDF — malware analysis report

Static analysis result for SHA-256 8925856fb0954626…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 08:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7774fd501ba178b6a5601d3766aab52a SHA-1: 9bdda7896201e1e9403ce93e0ab38eef9c490a66 SHA-256: 8925856fb0954626421e565f5937f1a9e197d2c90d7885c48e3a4515dad17a4b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an intent to redirect users to malicious content. The presence of many external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crysiq.ru/uplcv?utm_term=pregnancy+icd+10+guidelines+pdf PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3262d592---34377867596.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/22518290226.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7293879b4---56190560739.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/52657786940.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072e632ce0af---walimofixekofovuledi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb5ce305---6295747899.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084314978665---52309995505.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0722334db---85417048038.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6d14984e59e517e5e6ca9d53418e76e1/62877900948.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/jozawokuvapozorifot.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/14aa267beafa2ad516d2be8121a89456/78142705168.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/taxerawitejigigag.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5979aceac2---jenovejakowafasupuxeti.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/61081112578.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbcb6b81b---pituturupobexoj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mnnc32d09u7vue8t4migaoqt8f/tibirororidisegusimitew.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/54667836724.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/87947410624.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/35708635889.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c199e335036c0edcdf74c2cee80c32e7/34102936472.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/86121169515.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/73133760514.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_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 17060 bytes
SHA-256: 860e33a7b07cbb1d0ba04f763e43faeeb686ad69201b80f361d175bd36e24f9a
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 10964 bytes
SHA-256: b68a0d2f5b97a45998378e001a97313d1a3d382ee3bf532fe156ba936b28147f

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