Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1155d1c694f51e…

MALICIOUS

PDF

143.5 KB Created: 2021-06-30 02:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f09b26dee5ab700a25367514b3ce5ccc SHA-1: a6405ca72d518e5ee2fee179c925163106c3f818 SHA-256: ac1155d1c694f51e82ac5c042c35d69a3f9a714da1904f8edaf8a4b5e963c65e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 that point to external resources, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=american+mcgee%27s+grimm+little+red+riding+hood PDF link annotation
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ajanjfh449oi6ueibp1a2ltuu7/bixilag.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/10168464884.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df49189bb---nogog.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2983b02e71---98861236097.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/kegumiluzavufujewokupojaw.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0nl5u0egttvf12jetfb6gotl6s/42500555126.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/nitakepebiruvub.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e1e1de6236ffa5b5f7a519f98ef9643/jadir.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2f7osfsfg8f3tc3nhcvmpuu22u/7683726361.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093def0c8dd9---39463814223.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085155eca1c0---21667776300.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1u24ufk60nmfp0pqpnn8uo9i75/lolikusukolox.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dccd13d96---guruvumamawezaxijapenad.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0ba9ce90439953c331fcada984e72a3f/81562439742.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/465cb85e7a02e0be27be1cb3b1cc7aef/salezezeduzutufim.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5bf77cb14b0ceb73602cdeb85b50bd20/98156982948.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e9e36004---makalafopojonixujuvofu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/321ec7d8a7f7713e55e15147a94874a7/dorejanubuxefalo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sejogapufu.pdfIn PDF document text
    • https://jetaime-shop.com/files/bidazujagomadimi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784ffc6ad41---zefokasipexafipewakati.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/puteduvatitekenumukaw.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_off0001c4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4B4 23668 bytes
SHA-256: e579730ae6d22bb5ad2623158af9b10e4eb60b159a110ebb2681bbae940fc166
font_01_sfnt_off0001ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000217a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217A6 10832 bytes
SHA-256: 21b2ca7e10b61c16f50740290cd31203e8a5aac19a3f4b714fdae23e12167c3f

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