Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56aa4e42e3fb62d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 02:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cef5404e80caef15f108dbb270eedc1e SHA-1: 5a29c6be0472be8f473428f99274bffb2e1cc815 SHA-256: f56aa4e42e3fb62d31c86c51d47b27b30f8a121f5563aa20da9deb2d16408d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites, some of which are WordPress installations. These links likely lead to phishing pages or further malicious content, indicating a phishing or credential harvesting attack pattern. No scripts were extracted, but the PDF structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=hill+climb+racing+in+hack PDF link annotation
    • https://www.pharmawell.eu/ckfinder/userfiles/files/61845767733.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131664106e34---fipaf.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/79095500530.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_1F0CD51E53549B4E.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bca6607883---83997029735.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/rebukogeloketegojajoz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c40a2602---vevuganamapi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/upbt3lda16bj21n614e3c96p61/lonilegekejesujujojato.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/57156836209.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/14689177001.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/52098906319.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/pinotuguta.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d091b5ee37---tolizanodusesilasubiposo.pdfIn PDF document text
    • http://bdnchem.com/upload/files/kuximomame.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/86052418662.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ecbde2d8b---67630657202.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210911213253.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/demelagu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef2d61ae36---59456464890.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/fotinogixapuzuzin.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/40769886197.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901173113.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/9774977664.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/54558858320.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186c572eec---46820982633.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_off0000b76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76F 10384 bytes
SHA-256: 23ac4d91ff4e9ad5b52b2204a62ea35a84b0fa2a4f6eb1513f0fc10ca1022aef
font_01_sfnt_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 17196 bytes
SHA-256: b7019988602da8babbca1d18011637add968987043d45b8ae787b840893e59c4

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