Malicious PDF — malware analysis report

Static analysis result for SHA-256 762c5247549365ac…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 11:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0496c31964f107f99de86ac4ca6f6851 SHA-1: f0b3ee735d9e7376e00c5f3a8b63811e0931def3 SHA-256: 762c5247549365ac6a29caea5253e89d1d17e83ad7b17026f618882d39b02572
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alibabashipping.com/userfiles/file/99556441101.pdf In PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vor7k6v1snm4gl4rre2n7t7cn0/wenenebikolotivetena.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/xazivaler.pdfIn PDF document text
    • http://ozari-ua.com/files/file/mawaberevasupixelew.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/b0e592655b3f6553b0c8b9043aa2c604/77510137040.pdfIn PDF document text
    • https://mmszke.hu/files/file/bawoxozegata.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fe92c7d7730dbc0f7cbf7690eb145663/56899188143.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/67ba45cc284f6030022d25963e6cc423/42902430018.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6b43b37f---48594147731.pdfIn PDF document text
    • https://badoza.net/userfiles/file/zobituka.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/muromokabovevaberuxonugan.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210714121633_ahz2r9.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/ledetixa.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/5120738727.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fs6he2k8jen4eq9pgqte549afv/20632202505.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/9369372202.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/kipem.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/64111355592.pdfIn PDF document text
    • http://muszempilla.com/files/file/95085990802.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/luvikonufiwuvo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c605580f62---luvavinumesixiwasizuv.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tavugomaxurugeliwo.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=warcraft+3+free+download+for+windows+xpPDF 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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10964 bytes
SHA-256: 0cf84c4b05c447c726d43f255e00cb76d7a76c1ec7da8aa9c3d04bfc591d5934
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17196 bytes
SHA-256: 6485480f40fd3b99b0c9930a26a7b87b2a4050f83ba892da223fd5524bc483d2
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1