Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf09bfa009e5176…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 18:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e27d6dad77d6e867bcd4a5472c1c7dc SHA-1: 5b1215d5b8565a4f1fa3f91be5636ae3a16d89fb SHA-256: 1cf09bfa009e5176fd7d732f4b6f0e7becba2e7d6e71f595d390858e40b1f447
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.hebrewforreadingcomprehension.com/content/dopiwelamu.pdf In PDF document text
    • http://train-in-japan.com/images/blog/file/72045872220.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/jixarabexixiberimonum.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/junukejemukoseronazosufak.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09f39051cc6091367d732a480c88ca4d/sejumabuvimixumumegatu.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/94692474152.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xesibi.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/sikejirububi.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/daluxovogurebu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903175935_633770513.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/22326201188.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/wikutixenesiniliv.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16013652701.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090913314722345.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/7492109669.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/36125790847.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/jebexowarene.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/denakekokor.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ikqli8nivq64rvbvdajsg6lrjh/24459393122.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/sowufometebeli.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/77004286772.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eee62e671---19918346618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=whack+your+boss+30PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/72175116758.pdfIn PDF document text
    • 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_off0000baf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF1 16356 bytes
SHA-256: f2fb999a46c526d94b43c8827d26d4f04d0843cd2c7828a0fe9abd982cc26122
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10588 bytes
SHA-256: 0590ce01b9dac78afe2f4dc33992af6bc54369d95ad37ee8ec255c3ffea238e5

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