Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a9ef09916cee56…

MALICIOUS

PDF

80.7 KB Created: 2021-06-25 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ade8d2aee440c9e0d6971d784098d737 SHA-1: 8a2d9ac826e7f0c0e9e099aa356820a0b3c78a2f SHA-256: d3a9ef09916cee565a087f7710212460348d944ab461db72c10ba7c5c3c568ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites, many of which host other PDF files. These links likely serve as a distribution mechanism for phishing or malware, potentially leveraging embedded JavaScript to facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=clyde+frog+doll
    • http://anhuishangbiao.com/upload_fck/file/2021-5-21/20210521050926384020.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf60ae15aa---tosopupeve.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a312f05af6f---97402313975.pdf
    • https://goldenapp.net/file/tigipupu.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1da97010---xobofuj.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pquf6eochtpiqudejbh2n7f37a/87701919164.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2578c934b8---bizidu.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc093a8b1---nogatewesaporewofunipaf.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0687827285f0e029b8898cf6aaaf26db/zoxisezegawex.pdf
    • http://riskhedgetech.com/uploaded/file/1872367155609c15d3aeebe.pdf
    • http://aylincinarli.com/fckfiles/file/dimigajowixekira.pdf
    • https://louvre.lv/res/wysiwyg/file/zumixegekijiladusasade.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf2bb487---66737222731.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01cb83f30---37843797025.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03c4c6414---xomukepera.pdf
    • https://ancoraeducacion.com/images/wadesinogasoxawaj.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160815d6b3ec9f---7932193060.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b1e7ab8d---78357775542.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090467dada36---didizod.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/495409624dcc9f8bd0a2fb3435fb1a67/zedefajesisemeguwim.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f1ed6de4---76679041542.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/753a8f35a9d54b24673419026dede8ad/nesesikapizonotanuxumu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4f9523a6bc54b07c9e209ea643f82ed/beboxejuf.pdf
    • http://imreelectric.sk/uploads/file/16153614677.pdf
    • https://asset-books.com/userfiles/file/rumabulafadelifoxobegos.pdf
    • 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_off0000da93.bin
49fb03c7197e1567cbd098eebfe92f45f17896b4ffdf1646e80f7b76c9fb5713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 17196 bytes
font_01_sfnt_off00010727.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 16792 bytes
font_02_sfnt_off00011f3e.bin
bd00c8a59c2dfa1019d56b8f34ecfce05c5ecbf42286f19060989dc27ff81f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 10048 bytes

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