Malicious PDF — malware analysis report

Static analysis result for SHA-256 817045e156d9e01c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 01:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cad86aa47505117774f67d7f1fe9f278 SHA-1: 956bc4b795d1bcd744f77a2f4dc0db805b35eec5 SHA-256: 817045e156d9e01c1c87a0487a6860a6aca18b0d1cc8730cc4f3f71fc0f6b411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs and link farm patterns, directing users to compromised WordPress uploads and disposable hosting sites. These links are likely intended to lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=let+us+c+solutions+13th+edition PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2532u6scpj1tp5redgm13d7r3l/jurenawizuwetarimomovofo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102d81404cb2---22676886322.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/mogesamedubikodemuketo.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/9090634698.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/90109359861.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922b98bb987---zezometoril.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/xideduzevonijore.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/dobosimogitewisofenus.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/mowelavaf.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff92d6c77f---32608418966.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4446f1be49---wojanalodijimav.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/zajazitorapopetilogeta.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/032021258412.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/66987714101.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fojapamomugatabaraj.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/69854614388.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98d1ea3ff6---53115961938.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/dudemuzoseminog.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78485e958c909e8122ab2286f090d3b2/86280149770.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a27c94d8---popuwavilukorobojo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92230fecd---rixixexif.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc2798d0ec---4480067980.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e65830aa---35635312259.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/307e5cae7ca90c46c18ea2b165a3671f/gogusadoruvawoji.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_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10488 bytes
SHA-256: fc891690886729ddf849548985c9550db4d996133253318396025650574fb690
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17172 bytes
SHA-256: 7755819a11a8ce8cb378bc151ac5898c124e633542f11225ad7343a944cb890b

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