Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e863ff68fb119f7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 07:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a50bbf32258ece783d11a86d74d7b94 SHA-1: 1b777e36404311f18453ce34c84f8d85e2217751 SHA-256: 2e863ff68fb119f748ee7d5b33f66d4a6d16351e4190f3a9d7695498d4729112
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to redirect users to malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The primary attack pattern involves luring users to download further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7d5923bd---60218703523.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/lonomikesavuxujo.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/woloroleraruputikik.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pujikime.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/nozuxurobezegaxakunojez.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/87184916245.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/laxuxefuzaxifotumo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cd9g8t82po3forsrgrq6jihso/munitiluloluguweno.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/84536528752.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/35133171124.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b0b9c515b---remigepilazimewigigug.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/93058911176.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210830223308.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fobik.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b936e3667---63098937077.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ebf738abb---11015347958.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/dokerit.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fe514343cd1c80315822bc2349946351/49599515866.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609490ab82e8f---6333931089.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04e52ff3f---dusulupixemagotudob.pdfPDF link annotation
    • https://ost-fogging.com/upload/files/44629167708.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/32a3fe46cf6675db0e7aa44d65f99382/79855531954.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315eaacedd---37210829083.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/20726387049.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e6104b01---fiwufixoxapijubirafoxi.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/26003045781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=breeze+position+of+babyPDF 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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 17864 bytes
SHA-256: 199503152e4dfacdfc45090585f84f3b1c30ae402abdbdf6f3e1cfcdb9cdbc87
font_01_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 10672 bytes
SHA-256: 5afe5331bf0f6e6e3803b955bcfd5f52d2eedcb6e67fbaeec4394ffdc367eb27
font_02_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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