Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b367b78c51562da…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 14:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b1cc0d9cf542e169ffcea89b2f568b8 SHA-1: 739478a1f1f03d7c58800b1d5a364dfa6187468c SHA-256: 7b367b78c51562da655c2507d8457c279984dfcb743091a304fde36fc19d3495
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://europartner2.pl/uploads/vironu.pdf In PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/goxabinoduz.pdfIn PDF document text
    • http://186086.com/upload/files/migosokozilowafafoda.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gixodumokosido.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/posikalugefab.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/13502640690.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/42209738698.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lutaser.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/772dae26f2518271398cb253e11e6e8c/56689105036.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/56509832660.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/15204244366.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/78669101596.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/9796113605.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/2841176404.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/32703353089.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e911hqet5s7kb89ntv2mld57ef/79309521547.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d5f30a30---nixeraz.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/80358018779.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vuwajojixasoladivafex.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad681461d7b3859e1008374fccf38066/kewuwopafalumejebaz.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/jirozapunapejanifati.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/39761123676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=topaz+hummingbird+wings+promo+codePDF 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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 18160 bytes
SHA-256: d5a25b10f59b522290bf5634463ef6d8d86b6efbbb0356b07c94bea1c7b9106e
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 11168 bytes
SHA-256: 70c43a4e409cc5ede269e448b30fa18cfbb6e465a1d3039ab0ed2634ef65bce7

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