Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc730220eec8cc1…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d85e55c9326f42e66fb947f11954a950 SHA-1: 35f01d39036a5643bd818836ccee3cd437923a76 SHA-256: 5bc730220eec8cc12ba66a7f3b56e07e692aed944cfc01ae0f2af49df38e9780
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abpjse.news-read.com/upload/files/28821575332.pdf In PDF document text
    • https://ustunbilgisayar.com/userfiles/files/rujawotuwutomafaxewulidi.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zutudapexovuge.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/37747426804.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/37vgi8mven4ec5u8up17urt7e7/dulefonuworimitido.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/lukoroximovabiwodajojej.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/95348486343.pdfIn PDF document text
    • https://km2804.com/ckupload/files/fivoxadi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8775f621---66041060060.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/18363176565.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pemuridulakikixuxoro.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/dezapubi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kiradabizapipakibunilibiz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615252545b9af---44709047072.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144819e5d4b0---bajuxapus.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/mureviziwulomadotora.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/riwas.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lixidezowisabip.pdfIn PDF document text
    • http://4yoga.by/pics/files/79377846905.pdfIn PDF document text
    • http://rooptex.com/uploads/nesitiwuguvod.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/sokab.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/tomodudipumimapexuwuk.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/sabinizitozo.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/jokaviwukolunovenobebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chrome+just+black+themePDF 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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 14980 bytes
SHA-256: e7eb147f74a514dde1baf01167ea3db8463fffde38d957b134acbcc735082131
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10792 bytes
SHA-256: 386d01d38fd99b5c57f0ffdfcbc7a3db41e7cee67f8085497497620df957054b

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