Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a03dd17b42893f8…

MALICIOUS

PDF

88.1 KB Created: 2021-07-04 06:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52292874d1b9a6c2b51859d321e24c68 SHA-1: b860b395b9cfef5f07fe7f4be4f890e5f13c357b SHA-256: 5a03dd17b42893f87f1867fe02b491ae2194722d81feb3019eefa9794fe1c0bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shqinze.net/admin/upimg/file///49795610655.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d441f7fe---nufazupupokolofukutowubum.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c87b0378---badirawudan.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aafe3e09b---tukagurovefejex.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3712362570.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/16526365065.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/38155547781.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hequ74f731gvedbn1a10o5e1cb/jipuna.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607364945fd6c---zeparasaxugebaretiguje.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160977831668c2---31092442599.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/foc7vir2d69jh4hfob9p0l0qis/xosotezuwemibofusi.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/98005171829.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/5024702431.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05bc7e9d8---10018574541.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/92615077913.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc527b289ed---22336808053.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/45dee522a514b5a8f991c9310585e121/27145242421.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5f1c422fb1acefad675f0f7428b6210/xejonubiwi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9risql46s1kfj8cdrugc4121df/palizaluribopujaviwasire.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/66923599765.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/finilokesuwutak.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4n8im8mjhnet97k6o77tffmoe1/pezipogiketenot.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/76379450647.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab383e385---lakikevakozataludili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nursing+interventions+and+rationales+for+small+bowel+obstructionPDF 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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 16636 bytes
SHA-256: d3e70858e1886290e8758fc9a1ad31961780295a1a2b91f87fccf2e202e3bc36
font_01_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 11188 bytes
SHA-256: c0febb5a8f6f10ba70a485c05957a68faa946f1e31d2ccaa6af95968b9f42e85
font_02_sfnt_off00013a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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