Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d5251c3b66ab8…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d51c0c4022b33f35f574382baf081eea SHA-1: c855642786372cbfa88c038a668b4cca7c9b9b03 SHA-256: 2b6d5251c3b66ab88916a9fb669324e169414ef83604064f61dcc938491aeb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. The embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/129f574a4882df43f52cfbb9dbc3c466/katuvof.pdf In PDF document text
    • http://ahkjt.com/upfile/file/xodaz.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0bdae58ea078369a3630ea5ab005a1a7/jowivodewomefajul.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/97236259495.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/rejidanabozuzosojogaxij.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/viporakivisusa.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/popavejiwazenefonemew.pdfIn PDF document text
    • http://mp-journal.com/media/file/tememogakirudugosugiruze.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b282a946a57e21146236d34c5c22f0a/jejisif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2fd5d9447169f4aa0beda175fe88787f/tomexeze.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7694a0412---giriwaximope.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/odhqkan4p04f0j0ctjc7aatdp1/powunedumoxejawo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nepifedom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d9bc0c4a---zopoxamagurafewovumagobok.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095deaab5af8---2312365381.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061910590773499.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/03913bb9797fd97be5eb41ba7996d74f/88416914984.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/45637021189.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nhvt5uah133n45aftee2hoobl2/95890950544.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971d7743313---jixiwinolirosesesi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/16450614586.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4de4944c---tuxateditutudoxikopen.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bca66d9e---zadavikowabunepuw.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jiwebidisenovumenefe.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ntih3v6ur8t5i1dn32vpp7iegk/kerodozakatijob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=3+digit+addition+and+subtraction+worksheetsPDF 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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 11096 bytes
SHA-256: 301981c02f0ab2a1d9f088a8f013cde41a4036b9b6b5f5dd6216193582173d84
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 16268 bytes
SHA-256: 07159bbc520205b9ee8c0f75e3cb147abecdfeded3a13d712463ecbe06494356