Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ab7066e3284fc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 16:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90e37e7604f5d9ae64b5644b69cdc43c SHA-1: 914d512d5a9cf9601e35c67a80c0b96f51045238 SHA-256: bd8ab7066e3284fc2db8664f7034cdaa691c816004ee3c189ab6ba410ea06fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=which+continent+is+the+most+populated+in+the+world PDF link annotation
    • http://gbfrjournal.org/pds/userfiles/files/tabetenasazunorufa.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/futebisobogasuvuderufa.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/13835618736.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/galodunadelox.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/26726539302.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/488496064.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/36366032541.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/47343811948.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/sagosekuxujixutanurewa.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/perodovuzinup.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/vividamesunotidoza.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/18938443767.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/41997731295.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/sakuses.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kasowowevam.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/nufebu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631244229.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/tupezopiguxuwosuwe.pdfIn PDF document text
    • https://mahae.hu/files/files/mamefef.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2e9aqd0h7or26tha3m3tqg595/34948206197.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42910387295.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/xiximuwazozolimewub.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/kiparajokuda.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/18a63ed11c38740f477704cb240c6236/45314016843.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5b15945131419a93ba89b3b8fc4a4996/xesovonexafilerofe.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/binenigujabawumuri.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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16732 bytes
SHA-256: f992bc517f2666a4aac206951382b65ac572d83786613e3c8f59590147301d80
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10956 bytes
SHA-256: dc37786ae27d67de3fbebdd6ca92799d8233c4f411d4fe47c4a6d525b1e607d3

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