Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db58cde10320c1…

MALICIOUS

PDF

74.9 KB Created: 2021-07-24 02:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 56848a4245a22f85569fb54e6d56b7bc SHA-1: 10687ba865db4160e09276081d03822c186d27d6 SHA-256: e8db58cde10320c16cbad2fa55f097292c4f6f68a9d1374dae06ed997b853b40
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drvishweshwari.in/userfiles/file/watiguzewe.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d01a140c---41777232107.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cac651086---58497294011.pdfIn PDF document text
    • https://tl-systems.hu/files/files/58662807406.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/femiken.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3d5cba54---2631643221.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b98j787ii81spheld0icoet591/nomejonawu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d38dd902b---xonodakulizopof.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a0374fa4---baxulemus.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/65613901280.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/78462069916.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea0deacd8---mimepagosabenenovofer.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006c0e79a9---xosinavezawefedelemobev.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080032f1096b---rejutu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8ee44babaa2e5356644f000c74e38075/tajiletalalilonogon.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210620140745_gsvbjt.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/digajopoz.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/53955099912.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/6435663922.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/67734895984.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa5ca090c---18482804215.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1170b859ece7afb3c9418b3790a59229/57028817150.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/doboj.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bed7c1d070d---zolonukis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=literatura+1+bachilleratoPDF 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 10304 bytes
SHA-256: 7c35e3ae157d185c387286aec75e6416821c57d9e6f2566311935e2fe14b651b
font_01_sfnt_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 17648 bytes
SHA-256: be807b0d2b05f13bd5ecf9b3de5ef6a72d48e91ce980530236178301dac82eba