Malicious PDF — malware analysis report

Static analysis result for SHA-256 13932c021907b728…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 07:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2e634c5b6a4c5a8f0df039f6e18db9c SHA-1: fc91f11250be5d9881fb7abdd170d879b2c1186b SHA-256: 13932c021907b7280bcdf6385d014f1e6984e623ea670c14a27968e42104658c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple compromised upload links and external URIs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=english+worksheet+for+class+2+-+kendriya+vidyalaya PDF link annotation
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/24d0a696bd5d3c2d17ce81fac2ecb26e/29495494040.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7622ceb40---94386965606.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/dopevanisagowesuva.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/43364065598.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75594047306.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fixakilipanumapig.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nonatezipifidutakezos.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/84274442505.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e638f81c---92152976284.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/33561088878.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/gunew.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c75012327b0c89f03e4c7852e4e4f2c6/30009654397.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a0d4e71c33e51b679a6c26fbaf98bb9f/lasokijisububimojala.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/96887741634.pdfIn PDF document text
    • https://cubic.is/userfiles/file/xuxepamabolevikogun.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/zobuzu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57318aa1df---39836058774.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a028209678cfa52f6ac2651f8f759e5f/jigawabibebelajexawemer.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/67142973490.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/1957112662.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/2300019734.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zerilawasesapatofe.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/d760fc2b1f95e7d61f58d8766d9c4351/nejowi.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/31161164369.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 11248 bytes
SHA-256: 495f6a1f070c63caf45ff512f10669a48b1728783ea360c0d8f1b104ed5e4a32
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 18624 bytes
SHA-256: c623c0ba8a0e1f314a53bda9a78cdd0e422b4c4f5ad3bcf49f3370dcc08f1055
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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