Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2187bc7a4b64db1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 10:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca32d310b9b157734920b9d611d19655 SHA-1: 6554807242ef205a7817a509d1637fecc746bb0f SHA-256: c2187bc7a4b64db1922f6652f2b7bf8056e4cd6d7f19f24a836c8485d338b46b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting an attempt to trick users into downloading malicious content. Embedded JavaScript and ClamAV detection further indicate malicious intent, likely related to phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0f3b65cf---gagikalepaxi.pdf In PDF document text
    • http://4x4autok.hu/userfiles/files/49571835385.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/4413445491.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a3b07de00ddb9abf6d71b6ba7ca830c9/rofepasigi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///64076245903.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/79571117425.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/22543901951.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dulexa.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/63885152559.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/kigikobixoluzes.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/22331948567.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/bigodibogededitu.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/rarunomapofapuxozatumuf.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210917153807.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/31121643868.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9635090762.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/92242009438.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nawugimigevaxomibifeg.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/75702950059.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614423edcaf9a---vogosin.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/41531638941.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/pusazifefematobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hacked+apk+games+downloadPDF 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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 18088 bytes
SHA-256: 2feaed54c7017fe7ee2524803d8a5aec1f556e967894696b7cb9acf19cef8a0c
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10736 bytes
SHA-256: 70a3f3ce65416cd56c50f2c3aa80136f8cb6665ff53fca19749b3e33e58c47de
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1