Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2085674c6a164b4…

MALICIOUS

PDF

86.5 KB Created: 2021-07-27 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dad395a28a0ef4b4139814e00197147f SHA-1: cc503117390df2c591ed71173be1cb79aabb5c24 SHA-256: f2085674c6a164b4eaa0fbba1b6f0f1437c38a069b2f0c419c69a782d661d493
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests an attempt to redirect users to malicious content or facilitate SEO spam. The ML classifier output of 0.9997 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/o7tmci69dstoha08epb7546ljv/tazagudo.pdf In PDF document text
    • https://asset-books.com/userfiles/file/jarexemusajugu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8987d0211a---pafawidakujikanirumorused.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/246b4pb4blvqpjofvdaau4crqh/19174820618.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/tazutakilovojafitad.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/mekonaranawubijomixiluj.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/3569282621.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608610e8933e0---32875339586.pdfIn PDF document text
    • http://www.asslar.de/downloads/lexob.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tulifef.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/64343296135.pdfIn PDF document text
    • http://schokofontaenen.de/idata/58532401241.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/48rb52prrp22i9f9vaihigk800/gokamemewozoxazutefom.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/1949450982.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/acq35backnejjej8q21ooagtoa/tizumumilamevofavaxanef.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a443261737f---77734487539.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/vajuj.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/053861384566f9066dd640d08f4a19bf/buxedaw.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nukirosixejerataji.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a77db24ad---xarerefitugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+much+do+nigeria+navy+earn+monthlyPDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 18080 bytes
SHA-256: d9548d3cdb958a88d370cd87e513dee8c813e008f23fc98fe9aaa48031d983af
font_02_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 11008 bytes
SHA-256: 7bbfebc50f5c058c30e616550fb9a4cbd5e7f9b2c79217bac9c0b97d58d866ff

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