Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ce56ff30b57c0a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 06:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c006bf1f7fa15ab8c1379bf19d9dfa80 SHA-1: 108b3273aa4c70b3a7bbe6ddf03ba338adaa8752 SHA-256: 62ce56ff30b57c0ae6fe477cd79030c6e7fd84bd9e672aa92ec6d0aceb70c7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=contabilidad+y+costos+pdf PDF link annotation
    • http://namlinhchivietnam.net/userfiles/image/file/64922346036.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3899d46f---bedovukopugususef.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/69210780344.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/79747734954.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/72199297317.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db3dc557771948d0ec20bf3fedc89af3/banivobujigowowos.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/telunarominogudej.pdfIn PDF document text
    • https://soechi.com/userfiles/file/21452809512.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61720787386.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/22172838622.pdfIn PDF document text
    • http://someteme.com/archivos/_20210922212845.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/86564307906.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51089957610.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/21539596141.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/64989084966.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903012551.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/705934581.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/pezesozedawudovu.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/damasidejojefa.pdfIn PDF document text
    • https://mackbeks.com/files/file/85080562515.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2a6e954b---rovupusebowadezen.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109172158596616.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/moposadulakazi.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/51836285682.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jofifajakowomakafek.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/3060154073.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614257bacaf73---71215525658.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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17108 bytes
SHA-256: 52cd4e4d434927413f2643946a09f5f27c2675d1f0ccbafa5aa985abd8a5345f
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 10668 bytes
SHA-256: c77db826252c1ab705d074b58ba474457b10a0aef57280a628abc4f16ce2c7b4

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