Malicious PDF — malware analysis report

Static analysis result for SHA-256 13692e0f39b7985f…

MALICIOUS

PDF

74.3 KB Created: 2021-06-24 21:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6272dda063a3e891c2f369459427f0d8 SHA-1: 5921034a449f503f7e11725d590d95ff13eb0cbc SHA-256: 13692e0f39b7985f7c67e5a11559eaeb5c68b18cf270ffa4ab5001aabe901e59
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. The document's content and embedded links suggest an attempt to trick users into providing sensitive information, possibly by impersonating a password recovery service or MFA prompt. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e15c8d9ef1b12682abfc9ada346ee7e1/44669490657.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/75399478829.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wegidodamamaxesowatalika.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d6017c8089e8b5a264be137cd706c6f3/46776788972.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adca850bd22---numudusumulo.pdfIn PDF document text
    • http://soupworld.de/upload/file/xibadez.pdfIn PDF document text
    • http://texmet.pl/userimages/file/defepu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/80702535850.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/18809686570.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a778423bcd---53454214546.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088804896cba---83824702825.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9b33a0d9---84900195402.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160889fa45bc1e---wuverazes.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3u5334umd82vq2on75q791gu8s/futajejizo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/15814223512.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lifedixemofakemow.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffbf0da85---40191245769.pdfPDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=if+i+forgot+the+password+for+iphone+how+to+unlock+itPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5512 bytes
SHA-256: 2cd80a6628c57c0401f8204c4f312edab92439daafc4b5b408ac15ed9e7aa794
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 11012 bytes
SHA-256: 1ef691d4bc093342c506b9f202051dc6d333f915be63a13f7e664364fea9a80c

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