Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a098035b8c96b01…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 06:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed15a2ee3effcfd60c07763153b3b9f2 SHA-1: 143a8cc66514e8eaa4062590b17f5f22d77986f5 SHA-256: 7a098035b8c96b012ee8c768f811f92e9501e2b6c83b26070e2e8a24551293d2
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The embedded URLs suggest a redirection mechanism, likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://comtraining.cl/userfiles/files/35713359358.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/52279005838.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777bc8df43---zebebivobe.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/40335771687.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/17076923748.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/78009363164.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/d1mk6jl662v681u9o0omnd5cst/negegegofu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d76cad22df---84824707629.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/75577000197.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/sarifiwebeneserabexon.pdfIn PDF document text
    • http://cortabellanews.com/userimages/mivojilinuvarije.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/45664697827.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28798e1be9---24882014905.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95187331759.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbc3bc78f---gawewabomesix.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be6999324---88614814645.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/41940db42dd7b9a8b76e5c5972c513f7/fopupulisusexupizusowuf.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/nalerumivovunaw.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jetazakez.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8fc44c3b---88513273263.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/18009098515.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/jilevemupogadekebopavu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/1538239526.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/87219784072.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108280105134038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=baby+corn+good+for+healthPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a7c41a944f5d4d842a47a5727c9a99fa/nutapeb.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_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 17812 bytes
SHA-256: d6c2f4daf71b8615e00584dd04e852defa918f88929bd8fd5fb129b1ccb43842
font_01_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 10800 bytes
SHA-256: 2fe666fb87b42c7a111041a7a78f4f4e0f029041cdf892cbccc3264565e373c9
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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