Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e04f48835ad17e…

MALICIOUS

PDF

118.8 KB Created: 2021-09-02 06:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d37a87c005dff1bec1b20aeaefb2c95 SHA-1: 5134b769a367d8cb612757ff7ceb90809617d998 SHA-256: 59e04f48835ad17e2cbed2452f38f14de94f592ae993620c86c500598bca2839
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised CMS uploads or disposable hosting. The presence of a visual download button and a QR code lure suggests an attempt to trick the user into downloading further malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sport-konyv.hu/userfiles/file/xivuva.pdf In PDF document text
    • http://bytip.net/filespath/files/20210816222225.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xojivivotimaxazipe.pdfIn PDF document text
    • http://yjccnc.com/upload/files/molozikuvo.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/50079994162.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/ridexunazemesivoteka.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483e0e2004---90864228726.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ngqcjp816j89qqnim5s0jmmsh4/sisofatabifom.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/molagitewokorevufusive.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mikotavofusevodawelanuwix.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/21403356232.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1nkdo369nlp6lbol291pmtgs7g/pazamimu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca80bc32cb6923222899c2f686e710b5/1534207564.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4s4hla0cghj48f2vb211mfp6v7/fimunewomomegesej.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/dikerikopifisixaxijar.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g99dkguspv2ivndifisotdflf4/bonajufap.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d73dd578---90340392446.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e09b0485ad1951810a75f7bdfbf30998/78800156317.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/lukupukifij.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b0639c16---18322851414.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/73889556313.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/doxopusodid.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c62dde6a511b530512e286a20db18918/nuduvuvubumugijesuje.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/23455625591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=2000+fleetwood+discovery+manualPDF 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_off000165a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A1 19712 bytes
SHA-256: 0704fa501defaf38199b15532d806e26784e9a93f071243e15daf43334f37cdc
font_01_sfnt_off000199d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199D3 11148 bytes
SHA-256: 14b42b04d5b51a70daf49269152b0352d333fd72f04296e89e1aeb4a2b4c6417
font_02_sfnt_off0001b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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