Malicious PDF — malware analysis report

Static analysis result for SHA-256 08674aaafc3e6048…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 07:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 333aba6ef44762b7cca9bcb244c1fc6b SHA-1: 93c9dcb2f108aad7f14dc772f3c487fb7c4aaa48 SHA-256: 08674aaafc3e60486c99babcfbbe92fa2c96666a38621968aab356b5143ec615
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Installation

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it acts as a link farm, potentially leading to phishing sites or malware downloads. The presence of a security software disable instruction is a strong indicator of malicious activity, aiming to bypass defenses. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hongmao.tw/uploads/files/202109161821055227.pdf In PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/dusowusetaxube.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/vevivagewitufaket.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/91387610802.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/zaxabotinuzetufukupidevex.pdfIn PDF document text
    • https://icbacademy.com/upload/files/84811067924.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/niwurofufomumok.pdfIn PDF document text
    • http://contelex.it/userfiles/files/16102228358.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/boriporejigagujetozevimak.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/58649309651.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jegamipun.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/70219249458.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/bolufezideme.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c272e6c72---4306574336.pdfIn PDF document text
    • http://qdjshg.com/files/file/96922987841.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613103a3aa70a---75981798098.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/92208382409.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/sojulitisigidajomefitageb.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c59c90070---91078874750.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fanatapazuwitik.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd284238018021adc5ee808e8ccf9e79/24812345910.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/zuwefijoxubupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nama+game+file+iso+for+ppsspp+downloadPDF 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_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 10804 bytes
SHA-256: 75b15d33e3f0acc5d44660aba9a23a4ab4e76a57c0fc339441222920a0bd28a2
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 17356 bytes
SHA-256: 6b7a6d2bd58c0dcf729cfc83ba8b6c42d1848fbe10de540796ea8ab2c2dfe983

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