Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8b3647b92c5771…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ef6cdfa7eb61f514ae06e67fccebf46 SHA-1: dda4a2541772ec615e3e7958966165612d83273a SHA-256: 6f8b3647b92c57713f2e8089069dd4ed1b42124d4fe066201f87219fbe907c80
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gioiacompany.net/images/upload/file/4716424978.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/nqs4s2fqk2bjsl0tlh2btvg0r4/xelukarekaxatopukuker.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a13f0244dcd8dd0933192be97f354895/bawomovikuwojuzerix.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nizalad.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bulemagazupegurupa.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/41170278669.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/dumoruvukemilupixiz.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/12387811324.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52443052205.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109051311345442.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/wekipunirilotupajam.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/riwitexukukebukir.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/12029657416.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/witusikubunuxiw.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bikubopanonizuwakuvirog.pdfIn PDF document text
    • https://manenshop.com/upload/files/69949289034.pdfIn PDF document text
    • https://digireg.pl/upload/79510889358.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/laroze.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/18630870144.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25ig537klc2vd90sdghfimlst7/boloveru.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dde410d86---96896780199.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/skae02ch0vlojull2rkjhrmn92/pusoxubosewuvezarek.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/nowavavejelat.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614136d6e5c1c---polugokuxiwumokajozexis.pdfIn PDF document text
    • http://shesob.com/file/files/64322110845.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/20845406373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+skate+3+androidPDF 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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16260 bytes
SHA-256: 98b9a784ea4ea295734c123fc24ad215dc2b517e5982ba9a7c0205e0c51d3b13
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 10592 bytes
SHA-256: 51b5f2dc348c2c66241496e8c7e8e9ee356be98a5b088256a629fb4f94b64364

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