Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe0260855f71904…

MALICIOUS

PDF

83.9 KB Created: 2021-07-26 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84366e86613b2b5beb81b050e6dcf9f0 SHA-1: 166bb3d5617fdd13a9dfa0c489b72f7ae9a981a2 SHA-256: 5fe0260855f71904ad6050d408faaaabdd93ba5699ceb640528e97d9b29725a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.toptehnik.si/images/logogemekikalajafepa.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/45891683478.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40f34f39---46261571836.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gomafitoxejosesigiza.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fc4942350c3952d89db9f1e0c8f9f61a/junorobebofuwapalavekufi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kn6rqbhthg08lpqpabs3f5rnl7/31072963426.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xorojafivifujezi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c4aef99c---batukikadajiwi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tozuwusakokixup.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/96706072202.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84815537b---kikuzenopubosedubufas.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2eade52d---jawidokobijisimifelefigo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/50c498787108ffa86fde49ee3a201e27/zizabevukasixowoburugufi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/1766639871.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7a34a8b74b4e5d3af7c3ca3293a1b632/kesaxebadatenopal.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qnfoqgd66s38milclpcol8h9k1/fuwopasese.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a2966604---92575509050.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/powolivezorenaromefu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/68912192723.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/21010962690.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/91449701477.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/wijokenuwojo.pdfIn PDF document text
    • http://uamarkets.com/images/file/noroputewonuraluminu.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210613_CB1EA098F1E29184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+highest+chance+of+rain+todayPDF 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10816 bytes
SHA-256: da83542c71b599afb713d6ae07e862aff87667ab5d391497d2d343676e11a522
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 17020 bytes
SHA-256: 0118fd3ad7d6508e9a4d81486a5806b974ff7b99be469436b43b17d064d5be6c

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