Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9df9da789dfa9bd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f8fad4143f5012928a5340fd669ef16 SHA-1: 5040243aa35b6bdffe16372c67ef09cf1b4ad8bd SHA-256: a9df9da789dfa9bd218d109545dacfcc4ee7bb6daca93f3ed92db8c1c46bcebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=a+streetcar+named+desire+read+online PDF link annotation
    • https://volandovia.it/public/fileeditor/file/61834326829.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/14609007096.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/12344848986.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/42495497285.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/livakanamafaxadop.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134aed0700e1---sapazotituf.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/94892810357.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/36899494633.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/25391834765.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/rudirezoxexawilido.pdfIn PDF document text
    • http://builderall.info/userfiles/file/67269019466.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/wudesakinuremikazagig.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/46974079456.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/69304651332.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/942545aede37289f5f7f92615baac229/8162363944.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/20222105130.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/sobezubukusigifumizux.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/48663602383.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sodexebezor.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a285c9a184---81366423998.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/mibasujalupumorazagulebil.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/54964543499.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/88270615944.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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 10512 bytes
SHA-256: d238d965c1d171c10f86684932b6cfbabed16fce80162d8722c6483c249f509f
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 17472 bytes
SHA-256: 12b5055c87c3554b1f886dbbcc16a13e322c196b6ef0cf89bb4b12bdac815576

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