Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6bc942cd4a3227…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3579c3f05475476cb98a8980f05ab587 SHA-1: c42e7e204ed30a44029f10b6ac4f5a860fa51c97 SHA-256: eb6bc942cd4a32271db69fb4197991b51f8b9c2970efb2343eb4252e50ff584f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The presence of these links suggests the document is designed to redirect users to external malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=watch+bring+it+on+online PDF link annotation
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/8447745697.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/16922599289.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/81355023465.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fukoweboriludamojiwet.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613147d01f44b.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/33186690845.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/35064315929.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/nedagat.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/90323746231.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318a6111b89---nokavuzigipujokipofosawuf.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/zijaxuturenudodowosorudo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/24207865954.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/dobireko.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614558d204fd4---12577316091.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/19906579504.pdfIn PDF document text
    • https://mfdesign.hu/files/file/76355212111.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a797ab49---59709118973.pdfIn PDF document text
    • http://househouse.it/userfiles/files/51419386783.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/sajalulasu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/vanokixuxesobolosi.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/38043747595.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/37692502932.pdfIn PDF document text
    • https://loctra.net/userfiles/file/5933839712.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/32157742625.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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10472 bytes
SHA-256: 8a7378a114e7769d5be454605d7b666af0ffa164ee1c9d95ace08e2be81ed79a
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 18928 bytes
SHA-256: a68a1803df3ffcfbb1c6a3165dd58ec27a5585efa055c04e100077396ccb2778

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