Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd41afafe9c9d3b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 15:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3b78148bd73d9286b924146ede0bd7f SHA-1: 6d1e8dee54ab3f564ff13a10c689f21791f0a2e0 SHA-256: fcd41afafe9c9d3b48e89f469d36ec042099c98d4265a20b0cb96e27a5f97ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dazhonghua1688.com/ckfinder/userfiles/files/914907555.pdf In PDF document text
    • http://the-bom.kr/upfile/files/nukapitoramufarinurutapa.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/57494003616.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109081930397030.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f736ab49---10011851530.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/81268429357.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/61268536860.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/18279956413.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d2dbae00---28149494304.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62ac8665---vozepudaruxaxis.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/ratakolikemowusutu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/mujipelavi.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gubeperubolunab.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417500242.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/nomarex.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/gomari.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d78953766eed8dba67a7cdb64f93cfc1/57987585532.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/22818192806.pdfIn PDF document text
    • http://sungder.com/upload/36745515937.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/78619535039.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/nokifoz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9bjvgld70dq93ms8ecvnsn9an9/xonokog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2018+buick+enclave+owner%27s+manualPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 17660 bytes
SHA-256: 317964bcc86d54ed524431806874f2108bb86b88ace05c40176420a3bec9e380
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 11216 bytes
SHA-256: af968144eb173ddeb48f6f60573c31d977c1357fb86f4909b36c4da6262204a7