Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72fa5c1cc4417e3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-14 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25f568c940f608ea30b1235b7352ab6e SHA-1: 963836dd410f3307d65688f6bf3e1f260d323f71 SHA-256: a72fa5c1cc4417e3d9cd54cd65c1da0b1c0d5097cfc21febe69315d5436cfeb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a malicious document as an attachment to lure users into clicking on these links.

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 http://321eastern-thailand.com/userfiles/files/66719510990.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cce9160f19af65b4531269b46c7355ea/soxap.pdfIn PDF document text
    • http://laduses.nl/image/file/57494884919.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/69362072587.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51704756638.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/18222175600.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/84788612263.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/77883160887.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/rasimokigob.pdfIn PDF document text
    • http://manenshop.com/upload/files/26850698626.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/balojixapifegusolarizax.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcb8b9197---82448464879.pdfIn PDF document text
    • http://flirdining.com/uploads/files/57944777699.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210907035536986840.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/3020548838.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613170bad13c3---nozigilekofutajibejokari.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/78142151716.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/netazegidova.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/6494807359.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2aea14cb0f42bbe701430dd6948e56ca/loxovabanupe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fokozupegadizozabi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389b96d3243---gokimenira.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/nelujafap.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xevewojutavevuvigek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=instructional+objective+examplePDF 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_off0000c5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 16540 bytes
SHA-256: ed7de5a19436a6d22df9514aa42d7eba6e622dfa082867bc69836fa285428608
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 11024 bytes
SHA-256: 7ddad3b066ba0bc209ad6c6aa8b7c891d4bc9c44c6cb503dcfaafcccfdcf287f
font_02_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1