Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d279acddfec5b49…

MALICIOUS

PDF

99.2 KB Created: 2021-09-03 09:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b347ff78f7c55f94987c59c62a86120 SHA-1: 62141cef299f0d80f346c18e88877b9e95989a1c SHA-256: 6d279acddfec5b49e9e95a463149b32876c90a948f10e75d98bc18e840b6977e
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or utilizing WordPress upload vulnerabilities. This pattern suggests an attempt to distribute phishing content or further malware payloads.

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 https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c386814715---50180846437.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ro6dp2spg0h6qlb3v3od0uj9hs/98640476404.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ec9297396935ebaf4f53f6f7789d3927/79425740038.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b4af3facf06490cd028102b5d7c76110/meminidumulolujamugedu.pdfIn PDF document text
    • http://koala-al.com/d/files/jimesugefuwivizowujapole.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb6385d23c---vogadizikenabebafuwebo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/toxavukig.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e63c112418e81357b28922391d89299a/jiborujidupotupitatu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/dugikufin.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c641486816e---nolawevukege.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/02f58bsd3en4p10dvd28q3fl3t/pelipurudegofikefedogu.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/31834056496.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5kp06t01tera3blhbr0kbedpt0/54391631670.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-1/20210801035631132897.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b646a0bac18e7ad364a482483ea4740/kilidowugijavasovepogijim.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161024a6671f78---tekubopanipemezeno.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/51693029703.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/50400340753.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c4640a72e179eb6b83757655e5f1f5ef/17931887885.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/45184072287.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xepejivajefuvul.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3198c8302---73746400010.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8855bf72f---55341891447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solutions+advanced+third+edition+teacher%27s+book+pdfPDF 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_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 20180 bytes
SHA-256: 6407f70b0724b2f3fbcca109a5a06ceaebd9cde4c384807e95c50c4879679711
font_01_sfnt_off00014c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 11224 bytes
SHA-256: 516db1551777c2d0380e56cdb3ef313bb61df0ac85745ccf832c85e67767842d
font_02_sfnt_off0001666c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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