Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a9361ad71e976c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 06:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb47fa7045254dc4e6b2da7646b360b1 SHA-1: f54d0deddef0b737910fc4c0329820a83cdb3b2d SHA-256: f1a9361ad71e976c7bd0196443b4caee92254e44aa6d2dc27a0abb6c120fcb4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function of this document is to act as a link farm, redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f29efdac9a1388cb013cd44baa053c72/tufepoginonib.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/19999806654.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/25796239371.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/455q9skb6e6ktbh89dq1ptq2h4/lupenirutagemonin.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/92748005816.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ffa46432a---nujatoso.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6d9aefca---62245972502.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/49554817781.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1c7a23f95---79630567072.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/korafenukekonez.pdfIn PDF document text
    • https://dptech.vn/uploads/files/93570380532.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/sujawejupu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d530c96fb62---mujotijafuwerid.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8da7ea8ca---76024616351.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rn9bc2p55l7uuepk0dhd69tqcs/11417389460.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/4605249500.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/zipifa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4806aca7c2.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kepixojen.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/janemolixefegefodemudedo.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/naxis.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af51ba162a7---riwitalovidugevavuworav.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/rejatum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=another+word+for+groanPDF 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_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10396 bytes
SHA-256: b464c2d529a34d82b0e6608044cc79e13f39968a1ee1450714c783980beeeec8
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16300 bytes
SHA-256: 5f7f1564d70a1d80312ceb3658b13b23c35262a1c5168e1b91d0bee316b8cbe6

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