Malicious PDF — malware analysis report

Static analysis result for SHA-256 806133c78c2bdf19…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 18:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0302dfa6cc8f75b16a31879615ee691a SHA-1: 24951edb3ffe6c57c9b12261e43a98496150216e SHA-256: 806133c78c2bdf19832975cd3f4898cf2c1d8fbab7df3e7214f9cbe3038aeaae
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is an attempt to manipulate search results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://fitness-sport.it/userfiles/file/10295811950.pdf In PDF document text
    • http://www.radio-kum.si/data/files/dawivixujexovusegof.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63aeb32f6a---vanuwoxubivuki.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/buveropiwusokixomebijer.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/21455990990.pdfIn PDF document text
    • https://magerp.org/upload/files/rexegelimonu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/92921748343.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/gudidowibifapu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9d1a4d410fcf825ea7aa8e54f2b13081/13350073035.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5df98e46b---63861839927.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/79146702668.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kviri2egep4mtlc1qnvdvgemaa/53305469592.pdfIn PDF document text
    • https://memoservicesrl.it/file/65661979532.pdfIn PDF document text
    • http://www.siposferenc.hu/html/nelofivipilik.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/dt0c5tn8umhfemme91qf9te24d/6840679702.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cb7fd81c1db6d3047998beca7ede2373/fukikexuburivimaruk.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/eaa32dbce246b18ee5c3d115aae0ddaa/varegeto.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wefikitobupaburapajesif.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n7hgd1m8dtfoq8ucm8u1h4u0c3/mujaneluwoge.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/76466546260.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/wopezovanojizajufelozusip.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/72364213935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=physics+project+for+class+12+pdf+on+logic+gatesPDF link annotation
    • 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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 19872 bytes
SHA-256: c6fadff63bb94cb4328d3a5f6b53696ece92a221f1d93ecb6623856438a06ac3
font_02_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 11316 bytes
SHA-256: 036c75ab1694a559d0a7f699cc0352da68e210d542ed488f533adaf171fed193

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