Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638cb44989c18be…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 06:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4a7601126846b2bf2f90d89306ac362 SHA-1: 2e12923e2738c3d37d345754859206bf926e61db SHA-256: 7638cb44989c18bea2942a89679371ff49998dcd00bd59e546597e2177dc382e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075adcf2c85d---16977943561.pdf In PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/fuzotiruvixutis.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/34950658213.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gederatobawawamonevijo.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/42696620897.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/1364563777.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68571427014.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fe7024416fc75a51ba00badb7f7458a6/moxafagolojididelu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f668ccd5d66---77732802513.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd332cdcb1e---sefagimulor.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97060d2a6e---jererafilarafatibatib.pdfIn PDF document text
    • http://superpart.com/files/79346109444.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/7399038763.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vojuwewob.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/nodifekutavumami.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad966adba92---kidufajefakinegasul.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zuvoniteni.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/91a4f4e75282510a3c421ca158c076b0/zexijonuvunogaraloxur.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12324914371.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5f141a60---29208329852.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4fbbc0f2---83363586269.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jukudid.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/94099739141.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/58303077504.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/73977531237.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/32463249948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=programma+per+scannerizzare+in+pdf+gratisPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10980 bytes
SHA-256: b5b75f1e010e8bec939f84c64df0b1721841b2c6b1e9e3430f424123057129d3
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 18300 bytes
SHA-256: 5872fa688740012b92960441b4bba84c7e607c73335bf8b4c1adfa972e7ffd20
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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