Malicious PDF — malware analysis report

Static analysis result for SHA-256 8570a3ee276a84c7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 19:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 234741a8c597a3fd189bc0e832566d2c SHA-1: aa70d717ddc1280227abc35d815ea4554d42f88c SHA-256: 8570a3ee276a84c770f76fe1c84d1b4d9fbacc492dc87b2ec1e6953f42ba3bd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=my+telenor+apk+latest+version PDF link annotation
    • https://interference.ajoda.eu/userfiles/files/tabosuwebogafirixudineriv.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/magigivazowiki.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/78587731525.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/39969709407.pdfIn PDF document text
    • http://quetthe.com/upload/files/demerupakokegazexulafowi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c71106469b22d44dd795ebe4420faff0/62248902817.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/nazexik.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-2/20210902152828579842.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c66b562a3---dewubomojagorekijufuruni.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/60557745250.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/730966465.pdfIn PDF document text
    • http://iscelenie.info/files/file/16608208204.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/kirajopefinefazafevunew.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/88721818472.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/remutejun.pdfIn PDF document text
    • http://intersonik.eu/upload/files/jisaweforalezalo.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/nivakefarutemisabojawixo.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/dunelunarujudemojetufofo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72071173950.pdfIn PDF document text
    • http://theponghop.com/upload/files/rojebupupaxa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc6aa1f8619bd56c0ccd4dd0e567bb11/64162868640.pdfIn PDF document text
    • http://schokozentrale.de/idata/nepomuzexubufoxezowegasok.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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 10512 bytes
SHA-256: bb73d26c49b2400479d67bbfd3c410ad9c64fc77c997cf93fcb8a5dafeda464d
font_02_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 20620 bytes
SHA-256: a5c2209922467b3444f2207d4d1151434de9859527c9c5a94fa38738dc6c40ae

Open this report in the interactive analyzer, or submit your own file for analysis.