Malicious PDF — malware analysis report

Static analysis result for SHA-256 d591909bfb6954cf…

MALICIOUS

PDF

86.0 KB Created: 2021-07-09 22:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71a6d6ca3bceb9fd4613667cbfa1412f SHA-1: f91e9eb629cfc663f263946d6e3cfa86700196e3 SHA-256: d591909bfb6954cf502ed774b2ab9668069a116e0eded6db5a900aa8e34b820a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=reading+plus+answers+level+k+the+bet PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97bb33dcad---83053124311.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/25aajvsfsskjfhu6ql50s9hq6d/paweso.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7f89cf54a5f5773f8f39460160ca6637/doradi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/cf62734872d33af57b3927686c1c1ed4/78322194814.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/6512374288.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/laligebedudeg.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba9051e4c---61811510578.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68489762617.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/8167910739.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/vakajasilokikepilagiwe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/42835de6beaaff33bdc50836ebe77b69/20097217916.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf612ccc7b7---3573879708.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/34645994071.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7cc27ce7d---70695409443.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92903515876.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e5126f97527a4b5b42759336c714cc5/tawolifafavekowetubujig.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1cfb1b482f3dae6e361c0edbbdc5a8d5/gejuxofana.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/29911217461.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e75d182f753---79339728234.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/43917630689.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nojos.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/51697599613.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2c13e5c2---51531394953.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 18144 bytes
SHA-256: 2f497fc2bfaed990d7bf3161cbce8a455d56779dbfb0befaf67567bfa4bcbb45
font_01_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 11080 bytes
SHA-256: acedfebf627b52591caa89dbecbaf762ad8ac30851c1a4e222870351054aa3bd
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1