Malicious PDF — malware analysis report

Static analysis result for SHA-256 574523890bdeb53b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 11:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b70421a1e52feaa4e59298c3390e4928 SHA-1: a78bcf878f4fb73fe53e084d2ff490a0f4d7e0d6 SHA-256: 574523890bdeb53b90ecceada0b8907db99137bbb1f9e88f20382fea0609912b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other domains, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=thoptv+download+for+windows+10+64+bit PDF link annotation
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f8061f3ca1364de5a7bcb377b29f1311/direg.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/lejizejuxegedoxara.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/pavusadovisa.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/levezewewezu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e11b3bcb098c1a3425e7da505288e18c/zudotalotutapetitulo.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/wuropinenetovibunawoge.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/44216158489.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f36fecca97---22170691787.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/11425715256.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/42450461367.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/tavorapidotirafogomin.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609089912771b---8766995245.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/68934180648.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/loviwamolizefanune.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/viph5roolc6o4u9oen7cr83n57/20918100858.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/27334044540.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9604e3d34---34704740995.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kijiwapelexeni.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/71679305541.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/dakemaravuziwedukuwe.pdfIn PDF document text
    • https://soechi.net/userfiles/file/migasomitapumutoduduzuniz.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gigeligok.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0da5701a3e6437ae99cce3d9f2dd0c63/zafalovoxobijalu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/72743036850.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 17288 bytes
SHA-256: b23ffe5f2c048f819c53d2642471aa419e01037d9cf4f71706d5a250d7723a76
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 11140 bytes
SHA-256: 8fc80dc86b4c0157fb2a3aaab5d5aee099bc98479cacdd69bcd746eb00ab4118

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