Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e15a15235fd822…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 09:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 469c49e60a4340d4166467bfc7d4e13d SHA-1: 661f6c190af849f970f413f7ed210c414fae4266 SHA-256: e3e15a15235fd822c1c0d210db8f252f7d6703f075b5e223894cbde80f6ccc8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=essentials+of+investments+9th+edition+pdf+free PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a33c0fec88102c9721aacb9f970d96eb/59143697415.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sebemekujopopibetexasad.pdfIn PDF document text
    • https://brs.jo/userfiles/files/20627345514.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/bovenutijupuno.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc846286b---69700017111.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/xetaridodi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bosumoperuliretuzewizil.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/34518042579.pdfIn PDF document text
    • http://petrduchek.com/files/wedawevakanobowofuje.pdfIn PDF document text
    • http://gekon.net/userfiles/file/muporejukidolofax.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/32224380187.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd97b0f2bb---dukapinedadifiwatarikozik.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jivapajopo.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/d0ofragu5kdpp8r9vmchgibh25/wagupidedojizebini.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao4vs6b2h5747tlovu6l7f0ac6/pekirevekexeluzelexeb.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/2239853335.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea95d3c200---60393529277.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/wozitivawagex.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/77785461276.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/belerewilemesuxojuge.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a469b22a34---22736228195.pdfIn PDF document text
    • http://vln.nl/files/file/22241751273.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/90851645660.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097272b62d3a---towupefuxor.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080920574048.pdfIn PDF document text
    • 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_off0000c2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D2 10980 bytes
SHA-256: aeab88580764a10143c836df988b69bb5ced749f217f096f179ecd8834880d4d
font_01_sfnt_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16740 bytes
SHA-256: c254d6b2ab99d99e4583e54a9c03551a10285c6c78b084a5672d843994dc8143
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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