Malicious PDF — malware analysis report

Static analysis result for SHA-256 555010540d2d98bc…

MALICIOUS

PDF

82.8 KB Created: 2021-10-10 06:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62a8fc86738088df5e61c74726e694d3 SHA-1: d7a8d8e444454616d3ea625defb1c0ed7525aef2 SHA-256: 555010540d2d98bc6040e1447a784a4f67376b0f3621f971cf5b8e741c146010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dataction.org/demo/dataction/media/53780707273.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9b4358f3e4b4e3be27400096b7a34bde/58790099967.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/56547732427.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/16696724594.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///56843940974.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/21498822690.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/nekevujakibu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/filebepuxisazazotopef.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/33061578831.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/nanufofagatewife.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/18447717639.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/41541183423.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/gedomimawalimisagarojil.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/vuzidoregaronogegogorori.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/21925169417.pdfIn PDF document text
    • http://ombs.ru/uploads/files/41723306936.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/85bkgaqu9gn7taf8ll1e2m9bn1/76684130344.pdfIn PDF document text
    • http://retailcop.ca/files/48333232881.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4f9525b06e65007f910be1a72196d645/86574187984.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/55503711214.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/95062564155.pdfIn PDF document text
    • http://anm-av.de/uploads/files/55594121966.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/1069446729.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/40540053813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+quick+brown+fox+handwriting+worksheetPDF 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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 11340 bytes
SHA-256: 825f5d11a98c42f9e0379193d042224dbb0c6e6be275fe00d3c5b914664fd3a5
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 18968 bytes
SHA-256: 69f02748f9d6746b28084334c80ce738733a46caf7c6cf9d0771f1de3b3b4d38
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1