Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92392091d8031f8…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 03:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00013dd5649ad24723444cae2ef85525 SHA-1: e3b0e791a71a6285a0c72938a8ce77fe83ddf21c SHA-256: c92392091d8031f8fe408d512254f2e544aae48fc06965eb714023af4886dd4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kdbelektrotechniek.nl/uploads/file/rofubufaso.pdf In PDF document text
    • http://trip-sale.ru/userfiles/file/54890706212.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/bapewazugitomimakakik.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109121702157643.pdfIn PDF document text
    • http://szjg.hu/images/file/6892498991.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/gumimugezur.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/29c32cc34d0a12fc808d8d0aa906e30a/pamawiribin.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xakeboxivezajogago.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/boferunovugotive.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/73469306676.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/fulirasug.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/84334110261.pdfIn PDF document text
    • http://midospa.com/upload/files/bomuru.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21092308483652092122zgz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161505d60f0f58---3101665383.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rovafodasejoxawa.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/duganinaf.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kaxebilixosun.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9ca29158---vibixekem.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/sagekisomezikujig.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wimafesizaxokon.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/zivuba.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470c49c6d35---fuvusatuzafujagalev.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fuxezurutobi.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/munoperomaleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=funny+animal+gifs+cleanPDF 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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 14536 bytes
SHA-256: 2ae9a3dbe0cc17bc39f887e40c93c1c2d3a05dd21cd3b8d83d99eb4b25c3b016
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10552 bytes
SHA-256: ff7b631406ccde9279a023106545db4fb68eed7f3157352618346b6e0cb6e017

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