Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b2aae6876f332a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 19:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a58bcf723c3a93446f4603697fade84e SHA-1: 2d09151e60e61b6f69456f750c9e5f1ae9f03d5a SHA-256: f1b2aae6876f332ae1c3bea2fd0e6fbf6038d622de79c54d14a3b8a6d99bb92d
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, several of which point to compromised WordPress upload directories or disposable hosting. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document's structure and linked files indicate it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://soepcentrale-dekeyser.be/userfiles/file/dafuzujasidarubalilubugav.pdf In PDF document text
    • http://hoteldanang.com/uploads/images/files/16727776.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/74459545282.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/donuwasaxelo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d3eacea14de7774665a76990445dda80/kenubi.pdfIn PDF document text
    • http://nktrading.qa/file/files/japaju.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b778756f---guzobof.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/36717849584.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/20957781117.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/debisefiwedax.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/rudumesogojitisa.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/fakubinesikogakugufedupi.pdfIn PDF document text
    • http://greenld.com/userfiles/65009451858.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/2087062136.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/bojiga.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/rinazafasakipikit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9579a73ea---tejokurot.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/13283b956725b6334da236d578d7a4a6/38914978956.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jonunaripuxurozagumij.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/zefegizipal.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/rewifiviwimapoteba.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/tovumif.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/gomokagopulekalumovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kong+skull+island+full+movie+in+telugu+download+movierulzPDF 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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 17844 bytes
SHA-256: 864d2367f5ffe7f97179ae2e199911cbb64a3a0344da001f539c0ded620589df
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 11092 bytes
SHA-256: 14fb53682a6199fb424a484c4bfa989378fd7d8bde8c6c6aa156329ef6ae3518

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