Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a59847da86425…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 17:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07a0168b45c8c853dfd544fd6cde76b2 SHA-1: 9cf09d07c20c5ce53413b7d37fc860d40ce7b97f SHA-256: f98a59847da8642511c1bae11607eaa145e9886e4e677dcecb6ed94d7c5f8367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on compromised WordPress sites, with numerous URLs pointing to PDF files within 'super-forms' plugin upload directories. While no scripts were explicitly extracted, the nature of the links suggests a phishing or redirection attempt, likely leveraging embedded JavaScript within the PDF to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/26ee049d80c6921c0f559405d1c43296/18737759197.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/topagalidudevagur.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3c39af661769cafb9efa667ae7263bf0/bukozepixet.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/71262021880.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/97691ebfc8ee997ec35adbae9caa9017/77469420759.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/97287466270.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ef003dd9c0458e4f76679b51329ba843/92985952481.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160871e66e0cde---61034726181.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89027164446.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/legovujewibawubaf.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b5277751---65563468996.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/xijekimalu.pdfIn PDF document text
    • http://qca.ch/userfiles/file/tovivigurunekejezopulani.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2287bfc84b41a6e5362d9bdf58601a9d/45248795754.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd0961daa8---9078767176.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/22538276629.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/terewegizewexogoguj.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/zewimebiwabi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nomodexewotige.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xiwovejeposivimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=where+to+find+cyclops+fragmentsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 2128 bytes
SHA-256: 59b6fc6b36ed38117916c77086ca5ac0a01526062bf9e7e1bc50219acf010ac0
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 18024 bytes
SHA-256: 2cd2a0273b6c86cb9686cb4e3e264e8727020521ef69c2c93ba282dcdef84a58
font_02_sfnt_off000129f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 11176 bytes
SHA-256: 0486df80510b65c8eef44372fae125b43059bea0547d7817c55905a099a70257
font_04_sfnt_off00015bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD3 16144 bytes
SHA-256: 94ada888842219b54f0bff61c05754c95ee5bc28b4560123b174b2ad5ef12220

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