Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b50ff26cc05a1e…

MALICIOUS

PDF

77.7 KB Created: 2021-07-24 16:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e0ac6d96c326c988307fe0a813ddc39 SHA-1: 96f7f303ab92057d0c08d45f5170618b76f516c4 SHA-256: e7b50ff26cc05a1eaac88a04b4d58294eaf4234f5b411c88b2a3d7ada41f817b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links to compromised CMS upload storage suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zoldlepes.hu/userfiles/file/gerekijenogubop.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p6qf7r14s5ccg1odm8j7ee1o55/91230445285.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f9d26e51a1d05a0012a99b354c008bee/lilagogoput.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/03e3322ae4118a88395b508d27213ba0/fefijeduzodelalidisodi.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/40443785521.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55633e1bc---monam.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/tawavitizuvawifazu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dbd3a0a2f18295cc819c5094b0bfd65d/63114772639.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/29628101334.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a954d7c840---luzusojig.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8f5f86b061dee0a3599bd0912fdc2dfe/piripe.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/lumekegibevefanixaxoko.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/nizejigopejebesutudi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348df0e2d7---30769072870.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/37a677eac0d4ecf05fde26dc853940b9/36801196002.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1626421075.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/kazudovemifedalexuzuwupow.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/62921913367.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/dugojibipufuxigokexopino.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9vs744k4i28ia088q8td82efa5/vibevakewuwaguweferuka.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/77218544048.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b54ba9e---60991051616.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/feropupegimip.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/gafowawaboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+convert+kva+to+kwPDF 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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 10508 bytes
SHA-256: 31b29d2fc1bccc92fbf78ce045534bc1e8ca60382f11782872484a9b73a6ed50
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 17076 bytes
SHA-256: e3f5c38266f8d9849f008f8be5dc6abb8ccbfdca2897d5ce731f91a6d653d072
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1