Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb822084e7bb595…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 04:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8403ee90a32ef6ab369d5459e1e68571 SHA-1: 8e182a1c01b607277d196551fa69f7c7ed0f71c0 SHA-256: bfb822084e7bb59500fb7e93a30c4a3cc04153f02f1c3d12d6d8146be49a98b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://elperrocallejero.info/ckfinder/files/lumozazapofipufiludetaviz.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/70188439944.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/16174153642.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b054c95dcd---57238883423.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/4016159942.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/25196889278.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/27363474591.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210917095934.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba5c9ffc---17048116766.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/78330129744.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/32854396052.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/rizejejazez.pdfIn PDF document text
    • http://www.moyekolodin.com/files/doninasidi.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/97942369148.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/31595962098.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b137316be---85563960241.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///85909774147.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/96e3a19d56ef7ce2cd4a02f1dc84ab5f/zituzatidutinezidimimoj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lidepilapajilifixem.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/81900357223.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/66406918899.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/52376763163.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/3136283585.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e041d6300311c1cc8f30c77aaacd51/gesilipiripugapitugixipap.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zipujuzorumimat.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30606280740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=time+series+bar+chartPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17800 bytes
SHA-256: 56d81841198570ae9347974bb3d8f727515dbbc28911bdaba22a5bae1c26a2ba
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10328 bytes
SHA-256: 93684afb235c37f484a905559492c4e35cd0fef1100748ccdd9561d0294762ef
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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