Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a72efd9c5a131e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-07 07:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45693a0b6117bb9a46c6814154f6d474 SHA-1: 9401862ce575284ccf1f888eeadc879e68052c52 SHA-256: b2a72efd9c5a131e15f9ac59de67756193e54461d9693b424af7a82789be8b5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3d4a5cda0---wemejitifowedovi.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28bea75885pguh6k0i57n8bbdn/sowulejek.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/siwit.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a270ba69---10099064988.pdfIn PDF document text
    • http://birdwatching.sk/media/file/95767985375.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/96527021667.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/vikiwotu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/mobewetotaveren.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5dc2aed9b6430bf67aa92b59802d5630/xularopevev.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/jokekudarubikaro.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/aobb00rn6ke7p95tthj048resk/80908308310.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/54428708417.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/26004363076.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/folefovelopagazezilitite.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/84346333965.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070321a36af8---kerunavojidegisatonijowot.pdfIn PDF document text
    • http://irths.com/upload_files/files/puradekiji.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b54f34fa9---fogezefogamun.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb1283842---99247625951.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/80043296607.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/74880834254.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6e1c2165---foxewalofugomuk.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/55581925874.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kidexagetikake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kolhapur+city+pin+code+list+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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 18784 bytes
SHA-256: ba06c4c2c4a123eb1a142b6dc5bf4ab0ed00825ef575c9715ed11621d74b613a
font_01_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 10920 bytes
SHA-256: 9ff0249a100af1cb3693cfc86a9168bc1895483f98ab0e51e058feca5cab4bf7
font_02_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1