Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1dc961dabe5915…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 23:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dd8aa7462d82b3f9c1a1999730895ed SHA-1: 5575b2219703acca57e54851dbf2f17da3b56210 SHA-256: 1f1dc961dabe5915d8904e242c5f687a9d26af06933b9a6fc3654aeb7d26e830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lhsclassof68.com/clients/73441/File/55273056829.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5dc5b14b---59929217102.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1de3b93---wuwibos.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rruf6vis31jenh9oisub30dl5h/24734261259.pdfIn PDF document text
    • https://akconta.com/uploads/files/sapewalenupiwigawefub.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/kobiserilesamepopegireve.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/40917042223.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nekapud.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f688f21e---43387511843.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707c5411466---92337456478.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/eaf0992ddee46801b0ad19aab671064a/xulogubalosepux.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/76613300744.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/53738222952.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/tapolapipuzirizujiraxu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/778539220c899ddebc5baab5d8101010/mejowipiduviwolofebab.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/37202096280.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cf370ea8580873ab8a4dec9858860731/rulilapa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607afffac3875---95892256851.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6e48bd12---livikopomu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3762eb7add527d74f9de71c4d9d2e4af/pemujusunob.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/walolem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=user+manual+for+amazon+fire+hd+10+tabletPDF 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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 18440 bytes
SHA-256: ec04f53982d833e000d2d119750e4921ea286f3ff458a424a644bd6f12aafa56
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 11100 bytes
SHA-256: 2db358699949c3d06b2677cadedef735dc6e8c2a9369c608c11faeb8dd7690b0

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