Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b7cc7169beba5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 13:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 945ffd3e03d056674c41f37378cb1926 SHA-1: ea61882d4b27c2b3becb7cbbfdf8a7b0b50aaa3f SHA-256: 984b7cc7169beba58eb7399ef7875c830fdfc027f3aa8e0c584e0c1340e9b0e1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of embedded JavaScript and the nature of the link farm suggest an attempt to trick users into downloading further malicious content, likely a phishing lure or a downloader. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://bunyaminerdemir.com/resimler/files/20784832552.pdf In PDF document text
    • http://evolutionchonburi.com/userfiles/files/dafavowasobise.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22588857257.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96222127726.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/4731368814.pdfIn PDF document text
    • https://birudongker.com/contents/files/87751949754.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/dupagupuziwarodisagomij.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/76472703527.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/21367517029.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/40469459814.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/60160963418.pdfIn PDF document text
    • http://synhbio.com/upload/files/wowofefowul.pdfIn PDF document text
    • https://mytopics.it/uploads/file/58664503788.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630686804.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nujetuxonedewomebiwij.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jenetesubiwaroxofurabega.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74062464433.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/38334938024.pdfIn PDF document text
    • https://digireg.se/upload/67239006628.pdfIn PDF document text
    • http://swhos.com/upload/files/juvazevozefivaxekimi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bgkuumjnscpdi40p5tn54qg6p8/vafozemerokup.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kewaserivavobixukutogis.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/25405963606.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8vg0prj4d0s5oh4uc9042ntn1/85108160289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=online+sabong+international+apkPDF 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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 20744 bytes
SHA-256: 9ff950c2f332a076e663fad4e027fcbaf7575053a37776ab8aac801d5a1a3069
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 10684 bytes
SHA-256: 7ecd88286877e5b0c56c76030d3f27a73e7cbff818d31123204a8abec0f2545b

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