Malicious PDF — malware analysis report

Static analysis result for SHA-256 20212165161f44a9…

MALICIOUS

PDF

96.1 KB Created: 2021-08-10 05:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5337f7b2171ffb068faa77dbd6504a0b SHA-1: 01b210f329a498f271fffb915ebe9215cfcdc5dc SHA-256: 20212165161f44a9b80a685d721efcfb78750e37b263d0289f5f53dbaa42cefd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised or disposable hosting, further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=cual+de+los+elementos+de+la+tabla+periodica+tiene+mayor+radio+atomico PDF link annotation
    • http://kingsauto-bar.com/js/upload/files/zibogubarig.pdfIn PDF document text
    • http://mesterek.net/tmp/fuwaxadepuxo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd53e539769---dikeledowadovuratidibaf.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/89338229995.pdfIn PDF document text
    • http://funperm.ru/content/file/nanogotog.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0082b6e5a7d8cd1a61622a5588f153e3/61099613551.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/745150817.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mixukobodekavikajinunejib.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094729137f77---veworufaraw.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tanajeviwugiron.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/viwajubewagix.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/2674803663.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9acbd1ea90ae02df052e9a004d4f5790/tadewiviselepigaperaw.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/xikenoximikepawokajov.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9r5vjdcidhnjoqom1dp5m40nm0/73002987233.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb135b858cf.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/vomivupavagev.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c3e66a04594a002625c2bf5be8e6ee0c/82762340050.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sowepabigegurit.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/6165403100.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94c147610---vadeninotuxavafewew.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/fimodenevofubuge.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021071818595_528137187.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9b4d3aa1c4a63835b172523af2744727/fevaviwomoze.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_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 21620 bytes
SHA-256: 3037ed1b97fa50376ffd26d55db3f1966bc703a8ef172edeea1890b80c962e73
font_01_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 11060 bytes
SHA-256: 3f2234e61dfc6496c2b35fa731a2959a82367d0cdf598bab1511f1908e26f5d5
font_02_sfnt_off000157eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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