Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc14575d024e56e9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 11:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3be65b7513d29befb026e777feb1323d SHA-1: b328fe55d3ab04160cf0e2d307b68794bab400e8 SHA-256: cc14575d024e56e9baab1b09d8ace23e0bf3c34c74e63d33a0ebe9a411cc2d79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF is part of a link farm pointing to compromised websites, likely to distribute further malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=comparative+federalism+in+nigeria+pdf PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084313859459---72927493207.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/8034457303.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/lopefunuk.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rubibexifurepozebebekepet.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • http://blgjad.com/upload/files/rilinigetumi.pdfIn PDF document text
    • https://asi-filter.pl/files/file/65180235270.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/30159850324.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/julilexamedi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/paxulibelowilax.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/72379634848.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c570881fc40---24555615293.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/21729842626.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/vavovi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42118487051.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e8cfe8b36905dba03eba0cdd157df5bf/64221278312.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/xugalaganixalebirabise.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945ba1470cd---kobox.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/38f1dee6906cde84d6dea7f0407bd2ee/jigimixus.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/80959016812.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7494feca1d---worimubezudivakigowejijo.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/tejabakemaxepopogukib.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 18336 bytes
SHA-256: 5e10d23357ee33f034f4825f9a9f6e7c0315b0916d1b1e65d58fa6ecaff97ba1
font_02_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 10940 bytes
SHA-256: 57486c2405eaafedd60f0c472f2fb5ad1a2c3ae1614bc437239bd8134aba0004

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