Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04a7ac5cd2a94fd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 09:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cbd02e8bb95e10e5734bde160cd781a SHA-1: 6451c18f9c92433b487226e5cae512c580f59f39 SHA-256: a04a7ac5cd2a94fd92d2d74ef0aaa3ffcfbff9a2c2c6e1395e0e6e12cbd82ae5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=juego+estilo+pokemon+android PDF link annotation
    • http://farmandari-sarvestan.ir/images/news/files/giduz.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/72742708394.pdfIn PDF document text
    • https://fond.ru/userfiles/file/24150248033.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020835055866.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/84313225454.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nerus.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/59382728837.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/modebelolugemurotuxab.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/84289473638.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8c4e5faf80a16e2887bf45c5169f5e65/91977689789.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/totaje.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/77775667686.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c173710d5---latupuwupivow.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/nikajizekazolimo.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42954206300.pdfIn PDF document text
    • http://myredm.ru/uploads/file/wafodaxafinewegevajenas.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/60248698398.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/patolopefevudebutu.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/49755474529.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275eea9c3e---7445308113.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/13120630924.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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 19492 bytes
SHA-256: 4b56c1591ff46a808ab0bcba42166a0709c9e703070ace9b58456b8545b1a8c5
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10920 bytes
SHA-256: 48980668d187f0e8e87bfc44963e560ca3e85a19abe1014674991911f69bf265