Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b2a810b92cd8e…

MALICIOUS

PDF

77.7 KB Created: 2021-08-25 10:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b03cab46a46f523169a1f32b61e5c9df SHA-1: 7e37b6e5114eb925c464fb5ad8ece581c3b0988f SHA-256: 8b5b2a810b92cd8e12d86a2c082ea24718435ec8f7da0dab661d0f9b6322b62c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external PDF files hosted on potentially compromised websites. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nuestratierrapremios.com/campannas/file/31887491423.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/55680997686.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/50845020129.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612398cc9332e---guginoxewum.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/387873571.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5gu4tb92ghufc5bt87dgd28ik6/81291927905.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/23307902694.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/pibalek.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ho74vmnmntq7k0969unu6jau47/70149969713.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/koxigo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73bc7747bc---ginilup.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea105d0b1d---24239930442.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/darafolinenazojoz.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/21570605317.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/77256089898.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/31743294362.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/36867601207.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/pezefeta.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098690bd2035---motunejudopiwusuwagoma.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/29125360442.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/320123d2d31980fab49b0ff2551fc802/jujumimivinaxinosigagiti.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/22658958002.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/14837373079.pdfIn PDF document text
    • https://drlanda.hu/user/file/refarasazirejarekon.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mvqu3erg7bos9rr14s7d9k9un5/31955279964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=it+is+recommendablePDF 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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 17108 bytes
SHA-256: 655acfa45db08a39728a23ecf6287663e55c885cef758a8998c51d749ab159ac
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10624 bytes
SHA-256: ebc8087c0f4b9073f5c047dfa1ec5685d9ec8c794c6971db7aa787786023de11
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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