Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21d054593bcc73c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 09:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f15e8ad3696b407556c988f6fc6681c SHA-1: 28bac052292e7d3d63398c5267685ae44316f506 SHA-256: a21d054593bcc73ce494e4ff71e2acff044391e42db40dc8f8f71eee693af0f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are likely used for phishing or distributing malware, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious. No scripts were extracted, but the structure suggests a malicious document intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=clash+royale+unlimited+gems+private+server PDF link annotation
    • https://ooo-kenk.ru/userfiles/file/53872523714.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/pobetirejipixomut.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/55865694473.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/xasik.pdfIn PDF document text
    • https://ysh.my/userfiles/file/besezaxofoxesexevofilowu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/36611025898.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/fufabudola.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/wenekorakodaromixunom.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/musirejifaf.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/38249678349.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/xilugorizegedi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613627630470b---tisexagasapopamevijulipuw.pdfIn PDF document text
    • http://enkepharma.com/upload/files/duporaxame.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/86767290409.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/revuwekirozasafigusifux.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/65361265853.pdfIn PDF document text
    • https://fobh.net/userfiles/files/24105108585.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/rulisazi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aaa5fb35526067f5e6e98f3410ce4ca5/23381769767.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vogefezimevogipewigidufer.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109031232388930.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/92028250707.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc3d1043e---faregorexutomiwofex.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/87257657516.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/60731326753.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 17488 bytes
SHA-256: 3fdd6bf817dde0d66fdbcc4b96b02ecf46c7d1d48abe3c9f2cacd260b1f9697c
font_01_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 11152 bytes
SHA-256: 90573f447281904be9904746190387773bc3a9ff3db5911085e367a3ac5cad54

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