Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba5521ff32f53f…

MALICIOUS

PDF

96.3 KB Created: 2021-08-27 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cc799961dcb12e24e088db1986d55e8 SHA-1: 2e1eea6fba396266b4ad98ea13bd4e55835cd39d SHA-256: 67ba5521ff32f53fe17ebfe3bcaa7ecdb382eff0c79c721a5d766742c98ffb1e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c4fc4088---42229138997.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bad7e9320f74adc57a96563439e25c8c/radamupexotiponaribiwik.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/41781231083.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/lomoromulefugub.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/68433493164.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/bizezuseso.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/51478835303.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/846440523.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/52870294501.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/82144252133.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/10dee90032730bf9e18e74725ea06a9e/97129998707.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/90096365506.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/adbuehta0temvd7uclql6di0f2/gorafebexufugum.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/51178674228.pdfIn PDF document text
    • http://capital96.com/userfiles/file/68579674127.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/tasawawoladajunetokixova.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/47978108445.pdfIn PDF document text
    • http://cl-pub.com/files/files/23246150924.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cec426942---4090566135.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e0221df313135f46f9e05812b30f85c9/96675712312.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vtoms53vpin21lbjksb4vkgurm/mezafowejojamotimejavul.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/75cce6f1c59533a28c8ba4497c5cced9/tirigutavalu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1c73c487---38475146494.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9ec502f96---52078275837.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/94688929260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=friday+night+funkin+the+trickyPDF 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_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 10704 bytes
SHA-256: 42d615f8d42d7ce4e85b0171ba212adce6f1c91c04ed0abdd6c5626f636650ae
font_01_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 18320 bytes
SHA-256: c67352c66994c677b17ee11d46581c30c7ace9428c831fc3b4bb7daaee07a1e6

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