Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd80c555fe093ebc…

MALICIOUS

PDF

91.5 KB Created: 2021-07-24 08:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 721ae551e73dad8fa80922715922d900 SHA-1: 99cb94c84eea1c4ae9538e70dda3329a853cca8a SHA-256: dd80c555fe093ebcb9507484d923ffe1ac05c63a7dc36521ebb6f7f37ea5be22
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, likely serving as a link farm to phishing or malware sites. The PDF structure and embedded links suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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 http://pdww.ru/ckfinder/userfiles/files/67265701508.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c214f7845470ac04d976ca772500edd8/70229525223.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/xupadegavifofoba.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/wegenubifoz.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/37936144179.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/bodilad.pdfIn PDF document text
    • https://olterus.com/contents//files/62893601473.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/47124257548.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d749d90c03---kogijilufawizuloporalex.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d4eb0fe---pajusejepebazoxinokod.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9f36f83da63e2430310689768db9ee5a/xuxulemup.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/40213553984.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff18dcdf1f---58683875502.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jufuxebavosuk.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070c320c617b---79274406149.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/66036123401.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nojixafevu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fb6dl9v4hj2juifr8801r0kit6/tuzekifosapedodo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f573ffdf30a62a6170ec421923d145/91054983180.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6kr8j6jrvastq266uc3gdl32j6/soxavepofakexumob.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5284b041---texumalagawabege.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/15824279635.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3da0773b4c0f8f85e5dee5a6e499a98b/rugigomewotuwudipejema.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968ec04d70d---gejumava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=oxford+dictionary+translate+english+to+afrikaans+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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 17352 bytes
SHA-256: 05c18286523d3bd71fd32638d6eac84653de1f227967718460531a6b72e67bed
font_01_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E3 11232 bytes
SHA-256: 08e02de6239ecd7a50ea451e4a60571bd7ccf8bec043d1919846e260e2212e45