Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0243beb3bc6710…

MALICIOUS

PDF

93.4 KB Created: 2021-08-28 21:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 721d16a11ff407bfd9fba7943ac00b46 SHA-1: 32e415e110d95ea84e55cbee93f59fbe5ca673b3 SHA-256: 4e0243beb3bc671089fc9ece80ea0fa19bbfcb5b664f07f785af3208e0b84c66
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of urgency lures further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sowa-architekci.pl/userfiles/files/petepebisanosofugibo.pdf In PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/60507072838.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/gekenabunibus.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/fijetutobevadozowoje.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e4c2e551---jitipakul.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/foladizuwaki.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5e77aab7912e6cbeef8ccb6508f37e76/wesavevebejodufibanufagal.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/12185323484.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nolamo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07ad852f1---7815251192.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/mimiki.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/fizegomagaxe.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/28854880260.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/wuriwibepopuvazobarepip.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/viparaxuvado.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kjfmec23jr54pk1655num570m3/43911542194.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6c7b439f3369a3d44fc53dc50cd5222e/73821972274.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d5f40b245---nezetegajome.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dixujafulekoda.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zizogev.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb059de5ec---8914025398.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/goximezosipalam.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/9043715028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+certainty+of+the+third+angel%27s+message+pdfPDF 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_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 18052 bytes
SHA-256: 7959304e2570817f0943285908b2e3187d3ccd53dd707cc44e4e7f7ff173972e
font_01_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 11176 bytes
SHA-256: 422870e2416b179ac76cee82019ea76582dc072aa037a2fe8a383b7a46b071c1