Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3eb928e70b5dcd…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 15:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63780ea0bcaed09cd9e50333b24a93fd SHA-1: 7511a52177ad2a278df76c72f3d0e281f6d139ab SHA-256: cf3eb928e70b5dcdf9afda33029c2d0879dd21eb016855bd0b872dabf5a416b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple external websites, some of which are hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hoanhaochemical.com/uploads/files/dexemikomub.pdf In PDF document text
    • http://zerosquareonline.com/file/99933586749.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/malezimadevesolafa.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/52022462582.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/relagozera.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/wokasuvexezosukozuvenu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/82ef38d83b6ec2f244447ae1faa0a933/juvevoduxuwazegizotowu.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/40932580814.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/ginikixalesejabajogirore.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9de1f1051a9ce6fd5e2887c3205a296a/39333989084.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/52925360192.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/duduxulapaj.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109010635417285.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/pupuvu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/63523946192.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e31f0e0a6---kedob.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pozodenedowora.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/tabetaguwev.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117d7e1207---67740954314.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/42135291895.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/90416814734.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/76416141814.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/faxasewiwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+convert+android+mobile+to+iosPDF 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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 10816 bytes
SHA-256: fd3c8e282d00bc39132fbeba173720f15560242f55eed1e38b7ea6bfbd167d52
font_01_sfnt_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 16536 bytes
SHA-256: cdd96a05db695873c83e9d1644eb43e88d57aeaf4b12620fe9edd01f0e610766
font_02_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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