Malicious PDF — malware analysis report

Static analysis result for SHA-256 821a13d05495e4d5…

MALICIOUS

PDF

80.1 KB Created: 2021-07-04 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008cd10c1735d0062263428a9c309af5 SHA-1: 5b9505a4ad206c71bd7ebd1e03fd260435b0e2f7 SHA-256: 821a13d05495e4d59701afd1dcce0ce696d89cabf0deea11f11089089a18b10f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The primary attack pattern involves luring users to these external URLs, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=carbon+with+chlorine
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790649a0135---jezapanumebuxepeta.pdf
    • http://iltorg.ru/upload/file/25776705695.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210621_8CFFD189A90CFF55.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091272fd3d39---dinigosuxojipejutifer.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/k98jmjnofjh5blhli43bjp31of/14410562987.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609607aa945b8---50471807350.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/r72113vil1bv6l2t6g0952o8cg/38870385595.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e09d8b992367e2f32426e4d16c5441aa/45774231274.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lebiwuxokutepodulototi.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8ded859b---90657858909.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dc584f8fbebfa7481761a81033c772a4/75805158672.pdf
    • http://congtydaihai.com/upload/files/18930093403.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdccd84e073---zupaxunagaxutogi.pdf
    • http://inter-travel.hu/_user/file/bifetas.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3b8a18bb---jemozirevugoxafikitomam.pdf
    • http://hydrem.ru/images/file/wiwasevewopuzonuzotetew.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/aj3lmn9bomqn97i3f6gfg9uu3e/lonosib.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a445441dac3---60375467562.pdf
    • https://abugfreemind.com/userfiles/file/vafivor.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3e9b56aee5096eb8ca366c81bf50829f/kanizip.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba269e4efa---82508933538.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c8ed6012---gejagimepusemenuru.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6cce14d6eda1d77b775b0a12a1d7da84/melege.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin
95d0ef9e9b7d232c541d4ca9f10ffc6ad7304b8df6b06136131891114bc5cb88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 18804 bytes
font_01_sfnt_off000103fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
font_02_sfnt_off00011c13.bin
7e4031ac0cd2725566480fb9afaa73d2e367d8159140ba1ae72bd291a4b774c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10416 bytes

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