Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e65acaf34345b97…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 16:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 863ea61da25c0f5d5dd4a1cccca08af4 SHA-1: 497672201323576765596fc9edcbe3194e28c1e2 SHA-256: 6e65acaf34345b97f342a7da6dcb7728adc0af080fbeb7c5d81eb31280ae58c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ambvetfanini.eu/userfiles/files/41531898151.pdf In PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902105013.pdfIn PDF document text
    • http://mrybalko.ru/files/58401685960.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/76275032819.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/17156134583.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/45116729133.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/16771041113.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/vufilufudetedam.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/kopetalopilop.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/figilemevubolavababi.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/52818944834.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/13709011911.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ed85df6c---samemegovu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea3fe94f3---wutuwopikoweseno.pdfIn PDF document text
    • http://4bx.pl/public/file/10147170254.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/wetujexu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/45420883008.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tikalexoxavuzuxodokitu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/70431466091.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/nozufadi.pdfIn PDF document text
    • http://darec.sk/files/files/nefir.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/bowuzeriwexapokaw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b5d6515---xenoruzobusukugajoso.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ef34ff0f---56537063958.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/26944717809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=schaum%27s+outline+of+electronic+devices+and+circuitsPDF 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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 19044 bytes
SHA-256: 579048d1b43e4889bebe8e2f8c0905e0bb23c60d6033512194b57c456e5c1f66
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 11016 bytes
SHA-256: 3a9fd34774ce0436248c5bcf8d1132d136ca4a80c48039044bbdeb496cb12947