Malicious PDF — malware analysis report

Static analysis result for SHA-256 3807e40a701a98e0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61b41fe62e43a402c2d8bccd08a9c752 SHA-1: 7a16aca050f20000e7e5a9e3831cd381a074ac80 SHA-256: 3807e40a701a98e0b989f2ae4477337ca1fd8d007665a823fb408bc37099eb9c
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a malicious browser extension or update. The embedded JavaScript is likely responsible for initiating the download or redirect to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=house+of+payne+putlocker PDF link annotation
    • http://tasarimak.com/ckfinder/userfiles/files/mipamibikalida.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/29044227579.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109191154086862.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144703ee721c---82891559654.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/94642411365.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a76fb0b---sibutixotonubimujavonen.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/gepepagozuwimima.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6119feefedb395d6d733c420fb1d843c/6270657430.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74277953673.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jujogoka.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613337cabd2a4---zinowakagavo.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/60302700159.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/35916999342.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/43548406129.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/69477156996.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/13024124322.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/butaj.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/59521398339.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/vunimobesowin.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nivexofatejerutanubosexek.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/94042303677.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/vipiwepizewefu.pdfIn PDF document text
    • 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_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10676 bytes
SHA-256: 9661cf427454f7b39e46f5c21ac4dfa5a9657d0b233d0ed2c491015f40586bf5
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 17988 bytes
SHA-256: 1ccca5da2bf28ae88bf6b8688587c799937bb766b4746016a522e16b582fb92a

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