Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc00b03bce8d5da0…

MALICIOUS

PDF

63.9 KB Created: 2021-09-25 21:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a13c58b4f8e069823e5eacd3c6cbdae0 SHA-1: 3721db6a9dcb14b21180c4fcdf09fe4d79e00c27 SHA-256: dc00b03bce8d5da088a02b6ee6788e34a720dc6eaafcda0db191414e764e76ce
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3110

Heuristics 5

  • 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
  • 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=all+quiet+on+the+western+front+pdf+full PDF link annotation
    • http://giustizianuova.it/userfiles/file/25540517206.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/20255929841.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/pakubaf.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/4623915814.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2a649142---jedawixorafidujupibedak.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tovofagatenilana.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/78863868720.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/18853202960.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/80373597723.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/49063278529.pdfIn PDF document text
    • https://sanidom.pl/img/file/komigumasuwakamofutusoda.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/89433896116.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/bugejanugexakozufadaze.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/dadapamuxejabut.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613422c83d76e---vifamowixukis.pdfIn PDF document text
    • https://cargotavio.ru/files/file/gabudukivo.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/nagixilojipitisonit.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132819717246---6647267267.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/jofujateminat.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/80769339645.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210926000018.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/59232502617.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379d47bbc65---dezafozebetuvixabaduke.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25976600749.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631794407.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/josisigonopevomewik.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB778 16584 bytes
SHA-256: 8e45b1cbc38ac8dbd03a38495f30902e97e650be0e1a2ea903ab9f49ae127692
font_01_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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