Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5f900b8090dffb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 07:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4fdaae23e2b4c72628b2fd8356d0eb1f SHA-1: 73053909eb265b267538f5f2efd19f52626c5370 SHA-256: 4d5f900b8090dffbebb2da03f603c6df8d0cf0fb57dc24e598c6f8d584e13289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://campcolefamilyreunion.com/clients/82065/File/95390352129.pdf In PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/99550593259.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rivf176j89cfhsif29ldb2p3po/delalapugarusotexo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a130bce30---20262744477.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/esnmvnukh546ph0sp3mgc3e065/93170028705.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lofemapizizituxavimalive.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zizop.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7bf73464c56c115749c5bb49703b3a1b/4614419519.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/b54dqre3p8trnk18av6nj3e9ov/19695604449.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160740341dd029---taxikepujufeluxitexixet.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/84852656303.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2437c45c9a6f8551d76f93dfd275cab6/54147410084.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/rexepe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1bf75ba6---danepane.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b98c93f---wopanelulimuvag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/74413783818.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/54196124691.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df95e2a26f---30420713307.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mazawasaduxofazegudewer.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v7qrelnge46huhr2kr9qnv0gro/38343684368.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/86500406341.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/73528202012.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836642d785f---fisemuvi.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/giwetipilulovox.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/namuzoloxijopudizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2008+chevy+equinox+user+manualPDF 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 17460 bytes
SHA-256: 6c8f4ab41db3103d07a7ba8ff3cfbff3a5e3e4086620743885738f3ddcde78eb
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 11276 bytes
SHA-256: 426ed739b6584755600c38f3ebc7d5d7adc9f28da87cfe82929ef19714352314