Malicious PDF — malware analysis report

Static analysis result for SHA-256 899165be965e7d9f…

MALICIOUS

PDF

79.2 KB Created: 2021-08-18 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0100a4e810621b4feeccb0aa20f7a0a SHA-1: 3aabcdb279493ef005861e1c4c7b66c7b25777b9 SHA-256: 899165be965e7d9f8acc0fa65dba9a18bf4a267ac52cf2cdfd130043cdeb808a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hocaukhudothithanhphogiaoluu.com/asset/site/files/2354214945.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pje8ngemf7eu3aa1lqpm5ab1s5/zumazutibiwaxifi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772e6d050e---bizozukexuxetosexibaj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfdd3de24---lifaruki.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e827e09ec---26571788111.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jileredabomijev.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d762527a70c048adab4b47733ec9b8b1/buloroguremi.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/50324490733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53de56162c---benoxevedisaxaderojul.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/80672952431.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6088ed869---77297746144.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0490593fa---neruregovagenoxuk.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/kumufegerowa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061021582112.pdfIn PDF document text
    • https://ijp2.com/contents//files/67027833146.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0445d21379e424edd675c4c555268bdc/mupixosuxobigovefose.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2a49d5d116b9131c922ec0156b493a0a/lemaxizeban.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/58500771593.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec238b9d1---35560725982.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/nazebadorelevunejugabo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/58641269546.pdfIn PDF document text
    • http://renovator.cz/files/file/roveviwasikimofoxopijoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+non+alcoholic+beveragesPDF 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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 16344 bytes
SHA-256: 9a3c76cc4a3487d046d3b73a878543b9f0325793b8617dd9aa5cb89bcb3be4c2
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10708 bytes
SHA-256: 410bf9079828e6c2439c9198651cd7727e6c84a3ce4a1376ade714eecd1ea842

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