Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4660c5f106b8e5f…

MALICIOUS

PDF

92.2 KB Created: 2021-09-07 13:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59a1aeba33d4ad90e6438bb0c29f0913 SHA-1: 5beb799e8be5a5ff82bcb911db4fd9ddea616a4d SHA-256: d4660c5f106b8e5f354d9aa35e90c98ef4aca3e92d62d74132b9c21d29ff7dd4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://zuche0551.com/upload/file/41712113932.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6a46c0f92fe377655dfa73e01b384239/bedorefonometudeg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e9ec8bb7---perimumuguketaruxukadaraz.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/roburagekekududiniromumoz.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/rosafisuzukijod.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/46882045393.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833bc78b885---50014774281.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/88944661151.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dddbd7cbbbc95f12eba5d98e582fefd8/wokavo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3f1de6710eba5e490f97f9ef5d0cd53c/vivofos.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zoxijobenuzomovoxupesalo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/82250276929.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/554a37802d2d2ff7a05eda6b85503172/94844978780.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mojupametuvaxu.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/xinezopisipubizepudusiwuv.pdfIn PDF document text
    • http://fedoro.ru/upload/file/80868259787.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/83285511174.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/likesowanolupude.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/3469221293.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/movidugigebefut.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a905644b4---nimok.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/fatuxugowomiduj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51e95cb80---61483447073.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5f7d5975---poxamejujig.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/gedowepuzudoxefuvomuve.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2f4f10778---seronelemonidiwoditelobuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=livre+grammaire+en+anglais+pdfPDF 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_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 19256 bytes
SHA-256: 3ef758a2f826af7d92f3db15d4b8d27769332960482bda8a99a4d417dfecf04d
font_01_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 10648 bytes
SHA-256: 6df5c1ddd6ca2e3935ebe4c3efd68e1b55c047740f05e03a5dbb2f8d95538c82
font_02_sfnt_off00014ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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