Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e6bc547c7c0b5f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 13:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f4ea9990e562231eb73732fa590ce86f SHA-1: 96dee97c7b1dac800f4ff8326341f0bb8d77fbad SHA-256: c5e6bc547c7c0b5fd1f9fc4ef6325e08e463a86c972defbf2de49d0272d6a062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=chromecast+built+in+latest+version PDF link annotation
    • http://rosesrealtyhomes.com/userfiles/files/39101643269.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/79182351040.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/1477235134.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/najunejadamanutogumifuki.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4b61dc16d2a5eb46a16f97251ecadaa7/99151090497.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/relidar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ps9j0s5vht9jbrht8st1bp1mt0/zenizutubowawoku.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/foraresizividujigalazal.pdfIn PDF document text
    • http://htygroup.com/upload/files/68532651037.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/timawawaxikopobox.pdfIn PDF document text
    • http://519pf.com/userfiles/files/74181770354.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/pimutakof.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/80654530548.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2202666457.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/47235570259.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161432b2b64085---guwesija.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/98691300016.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/tuzatojexemevekawovid.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/80791908727.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/85789357416.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kutiwukud.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5f3166b---wakekanurovafav.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/degimilemex.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rozulagusagenomet.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/84189992167.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17264 bytes
SHA-256: fdb50f3371a5b33b1d745a6e9df9af0ee342ad5dbc200c5c4e1d155acb16b92a
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10832 bytes
SHA-256: 46a076d68122592d72b70f3df539934c9fad895472e2b383b555bb7e72a12303
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1