Malicious PDF — malware analysis report

Static analysis result for SHA-256 79377d9789471a16…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 03:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 004fc8e5d77a4dff3b9453192ec1790f SHA-1: 08d51274f9667277e208e6d8862352ce41be9ab2 SHA-256: 79377d9789471a16ba5e3104aebf73b65b30ad9452b347a4a56af3ca0f9794ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection ('Pdf.Phishing.Trojan') point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/lesibikumewutujagoxek.pdf In PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/palawulamelakepirij.pdfIn PDF document text
    • https://unosms.us/userfiles/file/fefewemirutugaju.pdfIn PDF document text
    • http://zatacorp.com/upload/files/xowekuwadigog.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/sozuxuxiw.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc11ab1f8---51750436829.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/bujulelipe.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/11978330513.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7404a18d---lexapiferi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wuwimenojisuxi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865ad68d36b---tiromodifob.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7c84ue8prtc9hc51p2s4ov9a5j/jagorexedonopapovakabip.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/1259523452.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/pozanonagejul.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b93832f8---xalalow.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c22bf6a18a---teravatom.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gi6pi9gu387u1f40qiivac1vlt/jezubaduluwowejowanemebiw.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/jimawaxorugedukubanu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6851cac4a2c15991fc47325476a106af/20818600750.pdfIn PDF document text
    • http://hrudolf.com/userfiles/selumexelamaza.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/bunuwerotakuloxobuvog.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/guzafifedomuwemebemax.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/bunosokaripolepilanowupa.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/81448d73e7025b6478abee4d1cef96de/suweriwojatuwelejinedaz.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/26274945980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cost+analysis+in+managerial+economics+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_off0000c247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC247 11108 bytes
SHA-256: b259b8022f684b96a3e0bd55a1cf70c918b305ff9ebd664b45e63e4441c0a3d6
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 15968 bytes
SHA-256: 29b9636949c8cb248d5c7cf3f7f2933c4ccfb70598357b1b9dc8fd0dd4e0510a