Malicious PDF — malware analysis report

Static analysis result for SHA-256 656c9560cc195770…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 20:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a16aca693da152ef68970861b9a2891 SHA-1: af905e526af819b2ad64a166e56a953e436feedf SHA-256: 656c9560cc195770ea7866a6dc4034b8327b4d97fddb4257b294376c4bb33cb0
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://stsaischoolamritsar.com/slbdavbatala/userfiles/file/milatupirixaraj.pdf In PDF document text
    • http://moristas.com/userfiles/files/63146547738.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/cogv3hpum1ospll6geq38kof7q/luxunatijomebuxuwasa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d63ebee99---dopolapiwolufoku.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/53492039720.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160afb22f36cb1---7457096886.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/09c0b5d09410f3fbbac097c80ed81330/rivawagepokosifirimarake.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/55366179790.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/uoh86vkojbjna9h0p9cf550mla/18602946214.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e50a630b3acac14e3d2ed6a870d50ac1/75359674002.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081af1b049ec---mokelatej.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fac86ba---jidinutorekupanelum.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/lufomilajuwarorax.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pnrk85vp1fgpksja8lfth1tm00/85868445824.pdfIn PDF document text
    • http://short-story.ru/upload/file/88812317855.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/68807137364.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/83270945616.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/64260940206.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/simisokijafiralekozot.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sefizufofilibojadimewisel.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfe82b84784e18035edb66b6965c52e4/63801334635.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/87368245060.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xinafegefawezitidu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/phvgvffo2oh4ce6hjs9dglepeo/61737040434.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f09516199f3fed364a82170fb57f5f2d/nifudatularumezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vsdc+free+video+editor+for+pcPDF 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_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 10336 bytes
SHA-256: eda2bab6a381415623d877e2ae67b9c8ed6cd15aae0579b7ce4c3a447a5e2039
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 17720 bytes
SHA-256: 3b3073afb97663f9ae7d254e8c7c1a29ec02ce5a9a0ba4ca08fdb83c65362795