Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3e4878f79d5091…

MALICIOUS

PDF

81.0 KB Created: 2021-10-02 13:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b1ed6e803979e66f6eb4d7673b95b7b SHA-1: 7bb72922649bd8754bfb9ec0f95115d80b08e479 SHA-256: bb3e4878f79d50919bc9a6d35fc2c2eb22e02398b79da3625f8dc7b0c23fa03a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://analogsys.com/uploaded/file/193752605561556b023d0b7.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614887f1ec60e---76440705993.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/mibupilegaxadatuv.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vomulowuxipamokelo.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/fatezojomuz.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/95559017906.pdfIn PDF document text
    • http://capital96.com/userfiles/file/46106146062.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01fdad4d2---44376616365.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fikekez.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gegusekanilowoke.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/godagofazu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/28842778794.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/68833071589.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614acb2549904---bugutujuzurumudijurigan.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/22586533840.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/vekitukivutifepowoxirib.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/66192192904.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/1912721502.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/64742084509.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/49602349697.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6332869510.pdfIn PDF document text
    • http://innotack.com/userfiles/files/2418121057.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/puvelan.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/gamoxokorudofelive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+city+is+area+code+209PDF 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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 10832 bytes
SHA-256: 7f32fc64c98f80f020a4c8d44dcaabd7a62e87a5c295f620fabe1b83fea46ca9
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 18436 bytes
SHA-256: d51fc9290cccba96c7cdeb7b673f203b21d274324ad6b6b38a6e2b6d82ffb956
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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