Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b777283f639e33e…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 00:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f75d75cd220eef2588465c60e17fd2a2 SHA-1: c4c30c2faf4e46f467143d2c7f28960d10012a1b SHA-256: 1b777283f639e33ef4900eecc437582f12edbaf7d6cad813c4652d06dc6e0cc2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially compromised websites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple external links suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=code+game+roblox+all+star+tower+defense PDF link annotation
    • https://togeltop.com/contents/files/840563179.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zolejoxebuluva.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/23676064304.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/lejixur.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/gbttq1k13i37qvd03q4r8ibcht/rorifamosemefov.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/89744689218.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/75563514045.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/61229904316.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jivefitor.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/77966105541.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/62350650765.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7fcd23d96d6773ce7ff4baf54fa79110/sukilukudonufar.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fda40deec---newibududu.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/71794020697.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210909_083049.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/sisuzibeliw.pdfIn PDF document text
    • http://midel.me/userfiles/file/tarimenutesetusezopawamow.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/fizovukeb.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xavolopaziragujasukuvaz.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/binokofa.pdfIn PDF document text
    • http://master-br.ru/img/file/duninuf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155af4fc9a95---24763253663.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1d208c143---29172959542.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/17750563742.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/gutadoloxo.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 17200 bytes
SHA-256: 4aede278b2237548fc46b8247859db00780b3082e9300ec447ec5cfd3b8aa2b7
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10964 bytes
SHA-256: 80e304d2b73dd0f82c0abe9776b35cbe5acd05ef3da0ffc960053533b5db45c6
font_02_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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