Malicious PDF — malware analysis report

Static analysis result for SHA-256 739444f7ce18fa52…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 07:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eab331b67389ff30f733ea9441a0586e SHA-1: 5497ed329b6024ad19849e47c883d2a94117c50f SHA-256: 739444f7ce18fa520242ce48d2e912652751ba355b6019fa530228db10e3217a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b450885e803---tufesekalex.pdf In PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59849356877.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8994ca9dd2d811fece98c2993aca4a6b/lizinibisa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8j1uec2e1qo33rmig65rt7ji82/37295917141.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/98154758969.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/womaxesabutakefaxanosu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/70935595353.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be42f37dd---17232761411.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160948b9b5d7c6---36390465345.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/nulipuxibifujifudomosuw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608786deea275---vevakasumetinosafituju.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12afbb35e---84447658152.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1fb415b4d---lanobimexameferafo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824806f2df4---sizevibuwir.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/602862c8612b0fc57734469b5909bc47/xugamezebotunanobaj.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/59048612988.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aeeb88d6f---22400745350.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa4e95482---95279615852.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/73432899726.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/zatarupinufusaxadavenojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hormonal+regulation+of+estrous+cycle+pdfPDF 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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 11168 bytes
SHA-256: c1709852cf6c4ce312ad199f15b7a71358606892f07429c40c062faad5f64bc6
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16528 bytes
SHA-256: ffec0a526f3e01d2af75613f2ee06c007854caa29c7e163f0994ee0aba3dd1b8
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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