Malicious PDF — malware analysis report

Static analysis result for SHA-256 3769503c23c69142…

MALICIOUS

PDF

86.0 KB Created: 2021-08-15 03:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 215477564ff10052e7c5faa199344a18 SHA-1: adc1df21a24c3ac86a274fd76dfe7fce2e0d4d1d SHA-256: 3769503c23c69142c039218e3dc6e27553374b2d10bbf8e04d803a51c5c1ec11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/52670681002.pdf In PDF document text
    • https://koncnc.com/genelresimler/file/sivamulix.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/wukezevamewukovofubeda.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608009d72ca0e---kojoganumisevosaxebazavir.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d1490d089deda8f3b5581118c398167/91875552067.pdfIn PDF document text
    • https://migger.dk/userimages/file/99582591239.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ec9448ed---lobuser.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/wimunedukaxum.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/jurasam.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/limavefari.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/zekidukiruruzubebenuzigeb.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ded60a34fcb---60226715323.pdfIn PDF document text
    • https://securitydm.com/slicice/file/posumediju.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/37417217098.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/81809612056.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/19827231160.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/72191865379.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/rarawakugisu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/62881673669.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/40eafab6873b62b98135ac7d988e7c72/51858266564.pdfIn PDF document text
    • http://asustainable.com/global/file/47037604511.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef91e4fbeb---34347171639.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9338fc65903bea6717918a63fb38cb0e/bowazazujojatig.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/867704110.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • http://geraldinekilkelly.ie/15685883689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nee+irukum+idam+than+enaku+kovilaya+tamil+mp3+song+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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 17136 bytes
SHA-256: a0ea35e064547769b1b327cd8fc339c3e411606b23bd8576b6ff44c6436e7e28
font_01_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 11444 bytes
SHA-256: f266eea9dd46f30ca83561fb8a6edffe9304283946684fa225b5faa106ca6625
font_02_sfnt_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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