Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f879587fbb01df4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 06:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab30255295e098ce40ea6892b8359f9c SHA-1: e861bd40f8a5bd031600b428dd846ac0f6c3f95d SHA-256: 5f879587fbb01df45d263c4e705d53cd1a76070a840ebfd031f4218f24e5f540
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The primary attack pattern involves directing users to external websites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=pdf+creator+descargar+free PDF link annotation
    • http://immodraft.nrw/images/architekten_agentur_images_/file/1604173328.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09fcc8c25---64877055627.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085861abccf1---muritixeledudojozakomarop.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/98a99ab3f266927399339e17f03cba3c/jisiz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafe961c17---66913268516.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/werunisajitaregaziwi.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/koritalubex.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/37645367041.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10b7802aa8114c96c558c7dcc6a6551e/jipugefisuliledi.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/sitaredir.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370c7ac213---71436163137.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/pamiwatotuvodele.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/70332360572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1279f5ce---33728649309.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/25943703664.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/15035157042.pdfIn PDF document text
    • http://giga.sk/storage/file/zitusadojuvabokijogen.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/vaxal.pdfIn PDF document text
    • http://strap.sk/uploads/files/32376843813.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/21107330455.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tlhsihfr6vdu47bve7srm4eja3/nuwedusanixopebupimezawi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b6777c51---zorep.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1d1f574d7---2058876055.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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 10408 bytes
SHA-256: 976e0d1cb862c0d456d1313dde0c7792300639c430e17a666b32748639fa9f34
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 16976 bytes
SHA-256: d2e656ab6d0ad86a53757b61d9d80cdf603f442d783edf38881dc0b530968f4f

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