Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a370476642056…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 21:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f76125059b1e3609f30bc8aa657cd9ed SHA-1: 9a179c80bf846d3e812c68c8f096a2de9ab3957a SHA-256: ce4a370476642056a19eb39d0ba48b7899c249b3cc7cf3a9abe8761c55de8b8b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=123movies+all+american+season+3 PDF link annotation
    • http://dh-cell.com/ckfinder/userfiles/files/kevixox.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/87916738495.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/20215962016.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/38622675509.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/48336039791.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/edde121f60c077c7c1f970b3f493be36/97965173269.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/dorelinosageduvafofajumu.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/wimezomeweguwunipaf.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/97044484430.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/79419571288.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040c13386a---bodoselisurumolikugat.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/141422283.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/37167512839.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/mozolonavibobago.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/30891059497.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/wikubuxupidazuderife.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1bb4105a55cc488d925e649d36b51587/nukorokirabusot.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/kedovetel.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99654419715.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/5628854286.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/foxozapajitorebasunon.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/wisapinudulepagokenavib.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/49704968909.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_off0000be3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10608 bytes
SHA-256: dcfcd8ac2c9c3316623bb7a62a77cd2131fc18fd637d3ce107615a559dd96007
font_02_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16988 bytes
SHA-256: 975a912dc9caad9039e2e8f18306271ddf3347e117d7df102374f70bba51504f