Malicious PDF — malware analysis report

Static analysis result for SHA-256 7568c07ec21756f6…

MALICIOUS

PDF

93.9 KB Created: 2021-07-08 01:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bcf2bc3cd4fb1f7b113750ca9439b9b SHA-1: e93af05ced6291f8bbb12ad1868aae058504682f SHA-256: 7568c07ec21756f6dd32cf0d1de56b2ed8817f97f64db854f47b77a9c2ba7d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links and the heuristic firings for link farms and compromised CMS uploads point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://dabaizhongxue.com/upload_fck/file/2021-5-24/20210524012329390620.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309530ebfe---felewexiva.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7f30bc76cd5ab59710cd6f8d84e87a77/56030039523.pdf
    • http://ahcxdq.com/uploads/file/300608545534.pdf
    • https://atamergranit.com/userfiles/file/jezubakoge.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/beasb7ecdha31oleg6mmb43tkv/66211338667.pdf
    • https://asiabiru.com/contents//files/83543463014.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vvjvhiogp7o0b1f95qvsudssj3/39756698681.pdf
    • https://ecotranslation.ca/upload/editor/file/69371636813.pdf
    • https://hijaulumut.com/contents//files/teradibakaxebisupave.pdf
    • https://amursvoidom.ru/media/files/81784989044.pdf
    • http://parkwaywest1974.com/clients/861606/File/xeloroxud.pdf
    • https://0900107678.com/upload/file/47742612526.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c8bb0cccadc19940be2075863d1dd59e/kozutat.pdf
    • http://animalscipublisher.com/files/upfiles/file/fijodugateparor.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b44b8642---17271404270.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/80040982612.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606c3a82a---nodunedutufus.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1c76bf07a38e4a0c1480617c0ebc7b8f/luvafilekajegudag.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c823e3bcdc---39524602313.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085941bf3f9c---mumiwoviwis.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23c057b51---90181172865.pdf
    • http://duonglaohanoi.com/userfiles/file/50578702985.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5f6cb2379a9fdfee788ad6c03147cdc9/nawujaverowuzoz.pdf
    • https://ltssinternational.com/res/wysiwyg/file/kezovosusolunowixow.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a550969d---siweforolusumifunaw.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ceb6f5f6---64652007886.pdf
    • https://classconnbio.com/img-jacson/files/rikiwojujul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sniper+3d+hack+mod+apk+unlimited+money+and+gems+and+energy+download
    • 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_off00010740.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 16792 bytes
font_01_sfnt_off00011f57.bin
d3bb6391da915e7e470881d2c15e172b98e8b2e043fdd472cbd4b676bf403db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 11600 bytes
font_02_sfnt_off00013a92.bin
f3c63bb8734cbcd85def6ece0d1943525b39688fcd856ed2e12862941564cccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 18128 bytes

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