Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f6ff9793106d38…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 07:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92f0631d7797469fd34b41fe6f083127 SHA-1: a9c0e32ddb83e33abdbf4163fd78a3256ca4d803 SHA-256: f3f6ff9793106d38b47d7c43115510fb150d88efe0bd6a7f558f6ff5efa5c858
172 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many hosted on domains flagged as disposable or potentially compromised. The presence of a visual download button heuristic further suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • 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.
  • 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://steakclubhn.com/campannas/file/34296804977.pdf In PDF document text
    • http://naviway.su/upload/files/ladazudubapezes.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5c6bimbq4c7gr2g0ebpm91jl04/juvivopo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed8bac953---77276448401.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/benipab.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/wejofojakifof.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bac44fca814c3dcf04583d1c145b1a65/90007546258.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/26308403180.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/kuligutapuf.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1cacd3af3---79896973455.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/19772624609.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/43704733276.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/60062637555.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161224adf07163---33329758899.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1fc1f6c030805d393395fdff8084a71b/gevalapit.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ffb0a889cc71687e351fbccee22078c5/debinajeriludob.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/olvehjf8nh3kkunfm09cciaji7/gixemok.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wotubud.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/varuni.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5c8e9ead35f5e0f4df3be48a64dd710d/butivenagutenunalupuj.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/zeregalojisirag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=risk+appetite+and+tolerance+guidance+for+practitioners+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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 11032 bytes
SHA-256: 98bf032aeb036fcb59ab75c7b25b53618177fd030780c0d98ef28b5cd0d06075
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 17524 bytes
SHA-256: e1e4459cbb1ef30877c7af885682f89903ecd2a4778b4f9999f862f653ce01de

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