Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37578120f45005b…

MALICIOUS

PDF

85.3 KB Created: 2021-07-16 03:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6900b6496328063f84f0161511a06dea SHA-1: 2e83a672a9e686ecb0d6dd96257bbe9523389dea SHA-256: b37578120f45005b2e231f2d432288f3df28de5905e8a788e0e2d243536b296f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage, suggesting it functions as a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tf98dsrpik5vfqfm8rere8nmj3/2106344977.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed900346f1e---18047622077.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/numikajetagiwefokobinug.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796c5e2feb8---kivexojovom.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sadoxit.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/53784684339.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/6928774112.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/66598374839.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a61325d796d---74787656395.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/bowojonodorazututamiri.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2b400548ac67d0e3c0842c854dc05879/nazaremuxo.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/bibojodetafegipogijagatul.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876cea05d4d---15032766517.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/12ffc353565519d523604f1261add0f9/64019106407.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/11872664861.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/85322596333.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2b6982be---jasonokinubevoguluwujan.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/77056010630.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a6b9f5961bedbc31e575e29bb26735d2/tukifapamatotigogo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f73eb4934---gumefinizenibirisejirove.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/74343861055.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gelorukadogibatida.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/voluwuzeriwemomuzakelemem.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=example+of+a+literature+review+on+a+journal+articlePDF 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_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 10940 bytes
SHA-256: 736b233e4341cf1fd0682452edb3fd166a447cf15a972b448c79a66f8e08912b
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16604 bytes
SHA-256: cc2a04daa39d9b22e58c27117b17be385572bc29b69151dff0b05afc579e0611

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