Malicious PDF — malware analysis report

Static analysis result for SHA-256 de09e475e54f4688…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 19:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d92896e29ad71165cfd565b178936a01 SHA-1: bd210bcad224f4651dd4a268f32ecb41e9e78f3b SHA-256: de09e475e54f4688b1e40def1af1c42dde6f6150cb76269b70d70915aac8ff12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=super+mario+odyssey+64+android PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc3407e25---10103683701.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/sararurizakunobekelogesa.pdfIn PDF document text
    • https://reniuved.it/file/vikadamurarekafirebija.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143587f923d9---vunewejajutobaw.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vupanonebogitokisedu.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bikegokevigiditojutu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/jesapomapiboxawa.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/zikotubob.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/23062c9f2a84010e1f4ed73c1726fbce/53861186683.pdfIn PDF document text
    • http://korytnica.net/data/files/2124697332.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/85879358116.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/kebaluzo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dililebikaxivimisum.pdfIn PDF document text
    • http://fructusartis.com/i/File/76624515740.pdfIn PDF document text
    • https://cardolf.ro/files/21243986097.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/80291713318.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/553904089.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/50757452351.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/20288027595.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/49529581498.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/94531003649.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/temabegefizafurimupap.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/firega.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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 18140 bytes
SHA-256: 52c8a562620b52da7012f3f6922f209e944224eafe51ac3eba06dcae75377ad6
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 10944 bytes
SHA-256: 4437f9909dbb4bf1cbc46428a84c944fc4c1929e1d53fa95c6fdefca0a21c51c

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