Malicious PDF — malware analysis report

Static analysis result for SHA-256 495acc2e37edfb64…

MALICIOUS

PDF

85.0 KB Created: 2021-07-25 11:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 698eac2f14e5e9fc857d1570ec07d32b SHA-1: f9b6bd7dd6eb94d12db6afaa29474cf908a2f1a8 SHA-256: 495acc2e37edfb64674a76a3a70bf44984223bce1abb38c7364a917ae6d0db04
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The document body was unreadable, but the presence of numerous external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a lure for users to visit potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chono.mn/uploads/userfiles/files/dawewalamelo.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/27383150925.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/75642680208.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9u05mok7p5onpouj9hturdjpe8/nerovikipixa.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/39013508332.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/10169996127.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/newoxezoda.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/zarorezomafupi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/fobigumepaki.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/q30r2utbuovfs42vsdeasjs1t3/zanerasemovidagipuvobi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/63fcc32d65fec1df3b28522fd736a65d/56418813401.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737807eee89---pamazasedurusakexubogu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd559f8a0---75692789144.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/df8cppm0i6n44cair3d4r25go1/ridodoxavobumij.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/larofazedumif.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/72520303169.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b31de85fba5---fexumubozuz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5820a2baed---mijojilejowovu.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/nujakijezovabimofaguxim.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/53lgcvh5ia2g6p64s12svoljas/buzusegubirerafekinijada.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/jozoki.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cbf121a5---mimakopuzulazotewosibigo.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/37305408789.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/14302128799.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41f736659588eb1ef851f280ba23aa6/92696546971.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7qfi2561sfrdbrvigsdjkuh68u/lokopujuwijunufiga.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/f4ikbmmus0c9qho5igh73sl53t/xuvowodavibufujodojifuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=economics+19th+ed.+paul+samuelson+william+nordhausPDF 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_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 11236 bytes
SHA-256: 8616d6e78f1cd3275d0813588d52ac7cc94c26d159fa2df71fa9c21c383dcff2
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 17404 bytes
SHA-256: e206ae8dd3dcf2816865ab08b291354c7bf3904faa4371d410db4f531461ba2e

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