Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c313a37b2fe2f5…

MALICIOUS

PDF

79.5 KB Created: 2021-07-06 14:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e0a4b0f94e1c9fb23278b7222ce94f1 SHA-1: 46026dc1d4801a0fc86862782b4b3568adfc46e5 SHA-256: 18c313a37b2fe2f55161066a4d35555cc9115c4bd1a9be8f28cf67c789918e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://amd-export.com/site/upload/file/radifewirut.pdf In PDF document text
    • http://auto-spec.ca/fck/file/23485141192.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/77526948517.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7887ba75e2---supere.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f9f601c4---zajifukuzusezufomitag.pdfIn PDF document text
    • http://usagimatur.com/files/others/58998706033.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/75612624172.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/28464576519.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/nedebarazokiwizisom.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a21a1926---wigenopovaf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3a920bc3dd7a3f208159698d84be94f5/misenupujenemit.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca158a827---63507127374.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607626bacbb58---zipapisab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2k4qpv6n5dli20o1erods15ad0/26787543984.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa28ec017c26ac34442c22021ed84858/pixelujotezaxuguki.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8c110162dd7b10b4c908f82332a037e/betipijituzozevajuwi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dudumizasopimitapikudep.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/69960375975.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/juturumudajopuza.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/sunetugetabolimik.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kajonujube.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65574f14c---36282450985.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/sorijozudokamelisozogudug.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b47df5162396155faeacb1b94a04ea6/99901547121.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909b3f8c94e---16784640782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+wrote+this+for+you+pleasefindthis+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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 16748 bytes
SHA-256: c5ddbe9c5f78fd449135b91ceae6911d442770fa0ac72ed467c61ee27c55a2f9
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 10844 bytes
SHA-256: e10c3a315f02669bfd578b443f25d8556ef9fb0ea91b90445f61100d91567221