Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58f402a0d9c8fad…

MALICIOUS

PDF

92.8 KB Created: 2021-09-10 19:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8c2a72622514bf52765f03ddccb09e0 SHA-1: fcecb05966e1b931562407568d66f0a57b44a02e SHA-256: d58f402a0d9c8fad08d5b6e25e429eded3d6ff2d0f4a2d55b54795d574b86c60
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://rivucota.com/upload/files/84881366875.pdf In PDF document text
    • https://projetounificado.com/uploads/files/86600747569.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/94966648911.pdfIn PDF document text
    • https://kaimano.it/file/39511759575.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/metuxima.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfa024c0d---fepijofuxanat.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/mikukoke.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/vagiziduvikokaxogabuvuta.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f39fcf66c5815b82465726a1e97ed03c/lalesojujijimuvepabojumug.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/dubagevabowagujowifezax.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/dasoseji.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/ruvivibanerijozoxewono.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/betifa.pdfIn PDF document text
    • http://aquatherm-graz.at/files/dewezoxixexakuborexa.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zekolizudujasixesebofome.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/86057102119.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/xemudirukotabiruselakav.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/51144497903.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/10004013079.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161364ed54ad5b---81078370383.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/11271966789.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613008732deb1---18272564895.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/febakina.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tutabipowagarelat.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/nexutakupowex.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903140101_1850974164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=home+alone+2+full+movie+freePDF 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_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 17292 bytes
SHA-256: 7984bff878452b55015cdb5b5be03d7c9047b13ddceea8e33dbe06e43f74dbdc
font_01_sfnt_off00013591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA8 10384 bytes
SHA-256: 109c8afa3e2be5f50b7383a45812fa2aa1cedb7672eabc8ba0add4d30ab913f1

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