Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d28369cf1c4a196…

MALICIOUS

PDF

77.1 KB Created: 2021-07-04 07:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c81ab1687aa7439fe5bc4bbd5f64c444 SHA-1: 04e4566617a76068cf21fc326945fd418a1affb2 SHA-256: 5d28369cf1c4a19630668bf7ccab59455a0066fa2de49d9765136d860f58f72b
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 CMS upload directories, likely intended to redirect users to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841c40ee200---razelemozuvipokib.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e7be0075401070fc5f8c6e3f17e3727e/vakiti.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/padalukexe.pdfIn PDF document text
    • https://loctra.net/userfiles/file/vibikejawaliluvapuriz.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b206b280---18543062805.pdfIn PDF document text
    • http://azizolace.cz/images/file/kekorepezevedunen.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e0c2aeed47901bd5d6af39f6f1f494c3/tumuralipavexonowogujef.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb116954d---87655094660.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0006d3910c---zaxusazesopixin.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wodururobamazuzezapatoz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fdbdd759---leworamaxipoxegavujufepab.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v4n3bjqgm3nn6h87vlg8jg9go3/vapomokewu.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/fb3ku4ufu6t33kjaqr6pc59e0k/38148832832.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/viwerukowowudosi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcb5c5006---xemakejadowimuv.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/firolatepezatinubo.pdfIn PDF document text
    • https://okvino.it/file/jajapow.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa31480f4f---84390040245.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/25/file/20210625_223239_156.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a678efb3---39490575947.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/xomod.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/od7p7kn3ct2tbo726ot12qbko4/60035643364.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b61f809c55b---lodugopizuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tom+moylan+scraps+of+the+untainted+skyPDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 11152 bytes
SHA-256: 30a50d8fd7333763ce4b2b0c504caf88175da5875f50df47442a9fb1b39f441a
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 16312 bytes
SHA-256: 6bf4c7b1250c7fd4f322692be2202004ef75b9264f8213c25467359e4018887b
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1