Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf77c5d5bc71d87…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 05:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1275c2b128921a2d526d8fcd5c963cc6 SHA-1: 4250a387df5cb1523de12d4106b3492cd1c5da6b SHA-256: cdf77c5d5bc71d877b4720f2d08ef7a809cbbb71fa0e824bef618fdc786e46c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://holdemigny.fr/ckfinder/userfiles/files/30451097487.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/robudijawaj.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l4noouqc14t5lpcecj04c4kitf/ritadelazaxixowasi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/90434138191.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivedotalukusepusovegi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/36097117923.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pawupodanalejuzoxab.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131172a645c6---6280551456.pdfIn PDF document text
    • https://tckontrola.hr/files/vojakijiwokufozozudibe.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/99888801341.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/dalakove.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/28185738621.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/2202989656.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/bidofofi.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/63546344831.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38415761818.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sobivedarani.pdfIn PDF document text
    • http://arsvet.ru/img/upload/nemusegelitabawitur.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/luvuzifatekutigejim.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/84736012719.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/guloriwupuvebumez.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/10120478921.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613866aa637d4---virelovezutejujixivogu.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/putalilibe.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77768745617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+failed+to+send+messagePDF 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_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 10680 bytes
SHA-256: 0001312989d6cf2473091fe7294107b608e2d3b6e5d2264a7a840149b9c6583a
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 18016 bytes
SHA-256: 1338d6e60b793a2931d7ca83f35bc20163605239bc10340fb5c937a1efa84e3b
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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