Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcdda35cdc0d84a…

MALICIOUS

PDF

94.4 KB Created: 2021-06-26 23:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bf899e364f0c4cc2b0f6b8448601b178 SHA-1: b6d50744aa8a028c97beaca1d43aa297c9232eaa SHA-256: 2fcdda35cdc0d84ad100393bfa81b7464a5e89456e9741364f54938afaeb9174
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tah8e4bjcomf8vf1rifdgen9uf/donejevaboxik.pdf In PDF document text
    • http://toicodonlyson.com/uploads/files/31369980700.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rt6na6kdilc2i0j9p9op2140rf/zurenegup.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/563f9799979955ef54677a9abfeec094/91105162033.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/26142620263.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pqrpcsdvn2s2pp7ur0ikc2pb21/bewivogijetobuvuk.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/33754465013.pdfIn PDF document text
    • http://rayanchem.com/d/files/sotebefosuwobino.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad10674e---98206390404.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kivulinuxokisus.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/67f434d48369645a38e0058484abe939/19552286702.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/budewarofuzulazomadijape.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ce3b1180e6afb9394555e4afce8419ef/47907358265.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6ebbfeab5b93f1dbfe3769332f57f444/39768477476.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de83996c3---merukepetusodagosapi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57ec897fb---petewewewufi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/38664513363.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd867904ce1---timowefesezoramidumobulob.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/50748443020.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/welutejudozulavunuriw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fae95fb88ac89a61d5f282b47dea20fd/pububixeroriletub.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/piloribugugevesomasek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+life+in+philosophical+viewPDF 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_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10620 bytes
SHA-256: 9bed98791c0da7ee511815c138c203a71b4bc531c7184f7f0023c7d3254c7311
font_01_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1B 17732 bytes
SHA-256: f903c4baf919c924bdfcd31e77367062d3249fefa4c9b285aef8c984b4a91104

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