Malicious PDF — malware analysis report

Static analysis result for SHA-256 43df766f80e21303…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 02:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0c2dccb34bb04cf9c7c38d3164c8a13 SHA-1: 0dd911eb60a524381743b1d30220da98f59430b3 SHA-256: 43df766f80e21303aee38b089b4a1039f093cb9c3d2b20591d597ce7948d1ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dejavuruse.com/userfiles/file/mesubijikuxerejugozofox.pdf In PDF document text
    • http://ctcinsulator.com/uploads/file/3616335319.pdfIn PDF document text
    • https://ikansambel.com/contents/files/71799718707.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/5684927710.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/30881133321.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/41717856096.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7c964d45---refanof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d24a6586f---misamabonatotiwadutot.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/49643172928.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7d26dc913994ee2b6579e70c75c65b29/mujujurukibojaniwate.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/zekuseviwebup.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109010757259221.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aadb36b4faee8abb473c03e8306f259a/moraxofamixumezem.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jofepofowiwidalavowufo.pdfIn PDF document text
    • https://somogyplusz.hu/files/zidota.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/70382799429.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ac16fefb1fee7646b81a65f699764099/46472158207.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/volaravokitevuf.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/darufomotezajekozewuwa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333aca1c05a---62557034676.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/1766281814.pdfIn PDF document text
    • http://recviem.ru/img/upload/kirosiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+games+forPDF 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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17632 bytes
SHA-256: e22009e4535fcf52340f41b48d1e00c232e14408e7b3cef90930096dbd601a1a
font_01_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 10536 bytes
SHA-256: e019c7cf562460b41be81b86ae0c36a663e817f567f23fbef074946de7898b5b
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1