Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb4e11f7791bfce…

MALICIOUS

PDF

78.5 KB Created: 2021-07-17 06:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a59c642e577e9fe1cda34c7bb39df599 SHA-1: 08e9df7ae20664ef245da12c2b61465fa0341934 SHA-256: cdb4e11f7791bfce44f0bef8cfd6b6f6641bc27633ab89f64ecb8ebab96c2c69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://asset-books.com/userfiles/file/tolofoforekujo.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609835127a956---6964381437.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1656a339ef1ca114863e28c587c772c6/ropabon.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/25894426674.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/mitebi.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wivasutiposebovo.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/47737341962.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kenufowesonox.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/pogevokiriwebejumujekezuf.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ef9b2206813d549846e6d53eeae84f62/88051466587.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/kelajoxizij.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1caef7e7---xuvule.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/36965401019.pdfIn PDF document text
    • https://dcimx.com/files/44781944191.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2acea9c1f05d5abb901bd9257a2ef192/69264616664.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/jajasividenoxi.pdfIn PDF document text
    • https://medtek.vn/storage/file/40803915717.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pqri1if69cdq11qsq3v4d9v013/lodanuv.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/wowozunagoxaralunitazaz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bb0998f1---kelifidumagapi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aba412db4---6962023675.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vepizifowufabesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=paper+football+foldPDF 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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 16388 bytes
SHA-256: 338ae7c1d9a03307123404a27da1a237695ce571c1fb2c5443638f2e6725e76f
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10268 bytes
SHA-256: 7c8c45a028c3f1bc995d9d2d8b801945a27588fac9d7971ed25fefdb72d54af6

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