Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adbf1e08bafb582…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 22:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2580f6d616c262915c88274e59a8f1b4 SHA-1: 33b13871fdec446375c8321cd97c3e9367326dad SHA-256: 4adbf1e08bafb582dd28a94a09ba71d5966461cfc1004a7dcf8b561bec1de619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. This pattern suggests the PDF is used to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=rum+and+vermouth PDF link annotation
    • http://eco-building.cz/UserFiles/File/sunudurilas.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/55063003793.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/gowepepidebupozuguwesizit.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/tetazuroritexale.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/481a826dd8080fec3f331bc7fda5402a/navapukubonarefuzalol.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7cc2920f---medetejiz.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/mafaki.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/lixuwepawavirevuja.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/67243785501.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/37803710103.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/15b746c9457a50705c962c218ab3355d/19646221493.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607049ff2b761---nevumid.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/79460539607.pdfIn PDF document text
    • http://robedecreateur.com/img/files/63206767629.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28e082f5fd---7532161540.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/019e0a9eb73e21ad4d00820283734479/bodufaforud.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/xijewujivet.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/22305753565.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/67622083398.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3edcb75d0e233dc09771e4c972843043/jurokefujujegeseka.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/mazogigisurofewesiwow.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095fafb424fb---9590780697.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jaxibameku.pdfIn PDF document text
    • http://mrybalko.ru/files/46669133148.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10420 bytes
SHA-256: 5a67681aa4b3f97cd0bac7b45d23d075facf3ac7fec34ef72d7e7b26b72025c8
font_01_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 18456 bytes
SHA-256: d33832ab17232fa9b52914c35715eb1b76cae456552591fabcc6aa694b46e236
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1