Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b7a17be74e5ec…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 18:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4848715d2d273e8b6c0c0b5e74ccddcd SHA-1: 3df3a95423b7890b8756cc2ae452f4f8b2c40f10 SHA-256: 973b7a17be74e5ec87217d6f97b44c7ebfad410ececce3480c1ca6d077b1bb8f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed to redirect users, with one heuristic specifically mentioning a QR code lure. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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://letdentalab.com/img/files/segizab.pdf In PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/pixezupuduwurotesawizake.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/xedanogava.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/67130770477.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/nebululipuworopefofasif.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/ponevuwagek.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/041f7c747d555bc7067fa0daf23792f8/43821463020.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/bopizivaliso.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ac932498ae25ddd80da6b990be29b62a/pelukovelaxuninezemolu.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/55523666418.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/wodefinuxavutedavaza.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/repilerepuzim.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/jeriresojopaw.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/rinumudirom.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2d2b14ac---sorozazupeduwomefuso.pdfIn PDF document text
    • https://razredna-nastava.net/files/96157160348.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kefofowibizagufojaruguxi.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/28650477945.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631318197.pdfIn PDF document text
    • http://headrepublic.pl/images/files/31034567677.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/8480444493.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/32468064696.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/77464209559.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/goraletofamexovaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=galaxy+s7+qr+code+scannerPDF 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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 16164 bytes
SHA-256: 62ec76f67ca895c8572f67fb17728416d05fc57cac47990ba1ee22cb582c4cf3
font_02_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10624 bytes
SHA-256: 61f08d60a1992bf331cceb9b7b0383c9b4d248b1d96a88f0cee0eac417c1ca0c

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