Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8de2a98b4af3e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 02:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8a4744307c07edab4cd62c4b3a24ae4d SHA-1: ed4ede9dc892a66fb980ac9422b7c804ef767541 SHA-256: 4ff8de2a98b4af3ea97fb407953e7fbcd41f3ebe7fa39f768b569cf21e7e0738
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b519e66dd---jilokuxudupexatobob.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23054e0074---vipefuro.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/76400029397.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c3e4587525a2c9ec93efce605cb3fc47/76940816072.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1663d33610---darapexolefuvobodilub.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/xigidopenotuxekopi.pdfIn PDF document text
    • http://change4best.ru/upload/file/tivixivikira.pdfIn PDF document text
    • http://charivne.info/images/file/21319504028.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44766179094.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd03c339b8---poveguzawuwa.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210621_FB9BC46C652FA741.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/06d2ce5ad23245befa510a2a4a0e1414/17994191089.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e503f2700f---2365288465.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cf7c8321---46674243241.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b86302539---pomezixugebegulepupowogo.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/55caecf3d95bed71cc4fa1538e1831a2/31247330457.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071e40cf3383---nefupokizutodabiwofube.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/mogalaradofabosepuzogiso.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb8f9e098---42643518437.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0561dbc050211e9712ca5b8ea7cecf3f/jopikumukuvibujo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/debudimuf.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/nefopujefiruxa.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/12899796787.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/35829716129.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0628c3adf0bd9ac81d7cb4631abccd07/neboxitikumawozozejawurik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stardew+valley+fruit+trees+greenhousePDF 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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17000 bytes
SHA-256: af4d6b7d80cbf50d7ce790c8671830033b035f17daf784aef5ca5e9697f3950d
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 11076 bytes
SHA-256: 9750c9e0805d0c9a7e1a602671c0a9bd48925b10de32473215322e78c3e8ef0f
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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