Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025fb1f17df1942…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73e61331863e680954ae144e0ae86eb4 SHA-1: a73714106a3e4bac68c6d65825efbb825a8baf8d SHA-256: 4025fb1f17df19424ef1c7ab63085d18ae41c6fe6ec832ad0fe793d0b4410eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs, including those hosted on compromised CMS uploads, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=4d+shiva+live+wallpaper PDF link annotation
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemizoro.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/2579070514.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/33799480573.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/95022276916.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/totisuvosezabidisatudadek.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vexogaxokixez.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/20588186271.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/69195781606.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/57f5398277e5347d01991e0ba5e4cb2b/kafepaxul.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/taxepawitanedamoliz.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/biropedejuzolusozamabenek.pdfIn PDF document text
    • http://domosplast.hu/files/file/97744616744.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l79548qhdijnfb9mqnkre6sb2m/xepepenexafewot.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/90654777882.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/37280607079.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5fec6f5ad6d315cf9e5c72151e15622d/putawojojudo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/62c6d868a6ff7555726506f5a5dcc033/43624238065.pdfIn PDF document text
    • http://industrialdevices.in/uploads/zunixerudubegiziwaw.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/xatunifelapex.pdfIn PDF document text
    • http://sartor.ru/upload/files/67620302765.pdfIn PDF document text
    • http://bdnchem.com/upload/files/gibejefekoxelefunor.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49954156824.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/54d5ebf05abbafca6c752674b6b31a8c/newidaf.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10300 bytes
SHA-256: 11272fd8c385defbdfe2b4835ea2af5ff81686e2338f8a66bc436a7198a04da5
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 17304 bytes
SHA-256: 863e0b4465c48e4127ab272b98c3b57a6a9ae4bbebfc36a1392d43fbc5221cc4
font_02_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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