Malicious PDF — malware analysis report

Static analysis result for SHA-256 71912ad97305103a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 18:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40354c248acb7dba82e99cb7f13d0823 SHA-1: 0c1e816bb299f6fe00a2a5c74741feaabea019d8 SHA-256: 71912ad97305103a14ff528eb5fbec259108ae62c8176781b74a4eceeb93c92f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://burragebrothers.org/demo/jolie/beta/userfiles/files/bikifakidudimikemata.pdf In PDF document text
    • https://aradmissions.com/ci/userfiles/files/85558791104.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/zasovojule.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/87687273575.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/65737766316.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/93236012679.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/zimituwiw.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/15847373243.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/28420777640.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/79904952920.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/79048231322.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ceb7c9e4---96906483042.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-09-05-34-20-49.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/86225923781.pdfIn PDF document text
    • https://southafricapools.com/contents/files/lenud.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/94645935801.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/46576388719.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87449829136.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/debudibus.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/edb0d565ae3596c3e618651d1a877304/37374895063.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/23776917726.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dekobigebiji.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614122e7081cc---63698611285.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/nafovisemugosojedajeteve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kruti+dev+font+download+for+android+mobilePDF 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_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 19448 bytes
SHA-256: e9e440f34c1d315f00cb1c690d22e1c428b15ea996aeaf439c6cb5ae469fdd95
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10732 bytes
SHA-256: c109449db5f78411eb2c372b167f0d22305180911fd3038eeb780c2c240c9115
font_02_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1