Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ffeb1dc5c66e60…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 14:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34fa038f2c20df84126e23644e499190 SHA-1: c98c82ba8b570ca7c5ac526d9a59bd102923d601 SHA-256: 16ffeb1dc5c66e60237f1e9a6de4075da329c856d0b72ff8b0eddf13d16afd94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on potentially disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://studiorapizza.it/userfiles/files/kinoluvosizakovexinesape.pdf In PDF document text
    • http://hnc2.com/userfiles/file/33670773245.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/62393112628.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rebotijapuwenamatulur.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/10347859922.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/31578111654.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d2dfe9ofjoe6bbu1g2ak1emflg/94166237139.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/90376442558.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/32175415119.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/46aqsph3bv62p1slumb8m3p85c/93492672811.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/498ssnthskuldl9pce5q7evle1/26378910476.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bikikowumepogugomi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/bebipol.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/10d84b8f6a613f3b9491e33c84aa1787/kibutoporuborexegi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624573176.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613186f1dc899---safafuxe.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/wogovurozages.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/4189504785.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/moduwifekazutabozifol.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/vejegodubid.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a51b9cf3---gulirobe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86qeangma72e6ta66emej07g3/bobonij.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/33638315285.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aff93289cd7ca30ded4fae2601284e91/89839237649.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072127595215---39523309505.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b5de9be64556f8b4dbdea0cd0a13fb56/talewepivizegizekowibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=damarukam+songs+lyrics+in+telugu+pdfPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 11268 bytes
SHA-256: 6fc405330530419a2f370f7c9323571a508aea496a7bb7f888b216c9348f10a3
font_02_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 17972 bytes
SHA-256: 5d0755b42a5ac86b449e4126df00c6b4f5190cd55e47fd04f18f21235b1c9e47

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