Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a32e0ebaf6aa8fb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 19:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0760fca02efad3c8d989830276f0de45 SHA-1: 9fcbe4408efe65557621e5f99f9294df1cd5c486 SHA-256: 2a32e0ebaf6aa8fbd53c1476eca04ecc5280ab5a7f8246b7d9525f911b3953c8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to external sites, with several URLs pointing to compromised CMS upload storage. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary attack pattern involves luring users to potentially malicious external content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422629769d8---62120249552.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-6/20210906161002851875.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/xakujugotas.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/togulukok.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detufakavaluwawopebikiliz.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/63232706050.pdfIn PDF document text
    • http://www.polni.si/Images/files/fekuxifiwobobizibusum.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/domugegojinaxelugeg.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5c591d4f708f6e905d9dc8ca9b69b5f0/2967939131.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/10b287031d5aaeff5c878468f6c2db1e/7196340360.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/popagezemiril.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210906_165449.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/11918147858.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/jokomuzugubatipolaza.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/lifuwagagovilo.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vexofuwokonit.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8edde89a9d8ac0eb22b728c613560bfa.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/89673789031.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fofofunukipumevejopisu.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/42363252007.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/71342000839.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/44913529049.pdfIn PDF document text
    • http://blccy.com/userfiles/files/93240302240.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/66754352655.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109151938396018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pinterest+app+for+android+not+workingPDF 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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10804 bytes
SHA-256: a89dd17ff652efb7214f3db6784c9c2954cadb63b1827056bf70233f84062306
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 18248 bytes
SHA-256: 4f8801ac5d533790cc0224b754844583da25721996349918b829715e1c6ad810

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