Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e922df85f00158…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7aac3d87cbefe876ab90f6f0920fd89c SHA-1: 4383af91d06f366b2c43449fbe2364eda3f5a4e2 SHA-256: 54e922df85f0015896f6a123a0a7c90b2c7711c523d16758f4037d3a733564e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple unknown URLs, suggesting it is used for phishing or malware distribution. The PDF structure itself is also noted as a link farm on disposable hosting, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mg001.cn/upload_fck/file/2021-5-10/20210510065520998996.pdf In PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/37cbacfe48b6ee3fd22be9ac23eee208/wekumim.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/64176989806.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/55109934193.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/pimijodususoju.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/90068779939.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd8031c4f---34214459111.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sutizazupateko.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/72467472791.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/a287a74e82745170cb8794f16c3e7dff/lonegulojevesado.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/5035368630.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/98786765982.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/788bc9cc7d99ff8a87d3ba57c2fc127e/gadepom.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gf4mcb9vrdv8ohhcs1hnc7eq1r/91684029987.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cd062bcd285a1110702eb596d13618ab/wamisurisixovu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/59923348298.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/29170564da1bff4932448c94bc586d71/garukubigamale.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/90635639957.pdfIn PDF document text
    • http://lecostationery.com/files/file/nezule.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wasisafatu.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zobigoretev.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610722165e870---31613000132.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/97055691178.pdfIn PDF document text
    • http://coffee33.ru/archive/file/43697404771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rick+ross+ft+nelly+here+i+am+mp3+downloadPDF 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_off0000c2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A5 17340 bytes
SHA-256: 16db557f34feb8c976db1eeb7b29a62e8d178780af62ec7a01f1bd62e034a616
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 11396 bytes
SHA-256: b0bbd417bf5817aa0731ebb0495fdc725e02175a0944c49e6e23edc6347bca58
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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