Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac8ca56a09591a2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 00:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb94b0be39e5f3dfb436709a4a13dddb SHA-1: c65911781c6709df42c8858b3297ef1e01ff27d3 SHA-256: 4ac8ca56a09591a2ea4332948759dabedf90ade85d412ed288489d24a11fc853
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=usb+debugging+in+mi PDF link annotation
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/towakeku.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910085504716.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/rivosilovojelafusuluduj.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/71191190735.pdfIn PDF document text
    • https://jensbrode.de/files/file/20196994134.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_27A2716304D513F3.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/85883235580.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130823a47753---13162624.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fizibelofemo.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/depipijoku.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/budenamumoze.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/texamegazupenunaterisufon.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2987574956ac604400caa08f9ea4c56d/wunutezamofedex.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/jomeziti.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dexizije.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/3542953108.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72d155f6c---mezasenunedujovesore.pdfIn PDF document text
    • http://chenruichem.com/upload/files/35264542913.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/16e7f42e11456945049c9720626291e2/11734476756.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/29733404421.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109101112072427.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/85169727313.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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17384 bytes
SHA-256: 67b5e5797c87df3f7f55f18b418f5989720ee1fbeed6b5376e7dfeb20eea9b3e
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 10312 bytes
SHA-256: 6c627af42d6105670153fd9f5fb1fc79f64c88375c876c86b3c8ddf57cceaf13

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