Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d87c08333dcf8b8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 334745104dfe33e262e00ff523152bfa SHA-1: 3adfbd4d6c04c1e9b6568eb184ecbbf58de05356 SHA-256: 2d87c08333dcf8b84ab256cfe58f11e4e695fd3481ba7ceabcbb26fdc404d484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

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://crewmak.ru/uplcv?utm_term=mudras+book+pdf+free+download PDF link annotation
    • http://jrmhandling.nl/upload/file/66228607714.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/31363004668.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/70681295238.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ms1gg843u1cfqnm8bk2q53a81k/pomojirasadogo.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/tasozabeboteratibe.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/jixekibejuwovigo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/xitegixawiduzefenak.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c416f938f0f---fogolozegirodameduwoxopeb.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/28596958622.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bff87b70c---kojenaxixus.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5648d1634876b1d4befee23fe5e7df/fugodozopowopupugesukar.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/65220177766.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/87336979368.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85673937372.pdfIn PDF document text
    • http://strandedtattoo.net/file/98521042237.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2adeac9cf---sifoxik.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088295dba632---dubulufufukogifibodefaxu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2f06757ed61f6ea0c5d4abeb9c7f96bf/4634012580.pdfIn PDF document text
    • http://chapelguild.com/images/usr/88174166184.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pujefurobasogatasadi.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/fazamonutit.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/41331747721.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9548849535319f71decb926a7fdaf11b/duvulumusasijurapakeva.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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 17604 bytes
SHA-256: 90e9ba7255fd9344399e776cba6fcb1addd3a8a077941c93ab3ef3325e00358b
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 10712 bytes
SHA-256: ca6032aee588e112bc68664fb7e01cd025372447725406632614fd9baf9f4288

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