Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cbf7d4f1506350…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 21:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d67965891ac6aab1d74b738b92cfa17c SHA-1: f73fe86a064b2d88f0f6aad06e0445b1e6246fb5 SHA-256: c7cbf7d4f150635088d23b4e7da21465426d5d143236b5c2a9f171cc18a71bc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and a link farm pointing to multiple PDF files hosted on compromised WordPress sites. The ML classifier also strongly indicated maliciousness. The presence of embedded JavaScript and the link farm suggest an attempt to deliver further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/um0hteqbsn4en2isjd37dd48ms/61344124383.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3af4dbb6b---nadixale.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lanafukejum.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa8b457cf---89467959792.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e31387e99---xomowonewunekijezezad.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///71559083953.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/96011789023.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/kodojadigesusurogitarumi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/penivunadedaluso.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5225a710---valilawalafid.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161239990e536a---51596552244.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kozupe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea50e2c8f---gutavukemukosedolazup.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/625c2734e64d4be10083495ec7ec93e4/40659075373.pdfIn PDF document text
    • http://accronline.com/userfiles/file/taravobudogob.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/muwisusabuwumezaxiza.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/11806552173.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/89ff6400758b20159c1b1f9dfab03564/bukizinifuj.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/47113090196.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/92271546002.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/majabuzukogakojex.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2de74fd8---87672928441.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nsq2dohedj28ssdnr587qkakjg/mukakonobedalokugemaw.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/wibufodezijaxijuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+job+well+done+meaningPDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 17820 bytes
SHA-256: d310957bfa31f1887afdb05f4976e7f91f21b5ddf906c50114d382a8dda0d709
font_01_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 10560 bytes
SHA-256: 4eb4e83bcf1721fbf6c3ac32c83f36ca8db3eb430f8250caa389696d5bbcf1c3
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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