Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d51c75c6b8199a…

MALICIOUS

PDF

102.2 KB Created: 2021-08-11 21:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aa33c4395e5d546d1cc2dfa48ac92cd SHA-1: 0355153536832e1e8d52429e826c75c40897c916 SHA-256: 52d51c75c6b8199ad5014d878d76ad5949887cfc47e8886f8dae58f0dd1090f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL findings suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alnahamgroup.com/userfiles/file/soguzafum.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d036b4aa8---2604630999.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/50964052020.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6a248c4e---56626152824.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/48747ad32c6c86f7364de72c0cce26e2/zepebufotomazuda.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/f6dagk0v3lcm0570p3llbfgdm0/basotewixurafitojopijunig.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/53071979595.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tavukagalunesarajiz.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/cd90c621b140f7bedc76783d79c6013a/bororamujisexiw.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/75787053173.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b4018520---savaxigurevobarife.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/todunesikedoxifuzeduzug.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4b01d31fa---kibufizilibufokajukixun.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/nabuxufukubawofevera.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/nofaxala.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/15682521354.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/68449029405.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/3953315917.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8df6db058b88de4189dc5ba7b6a250ff/21891395095.pdfIn PDF document text
    • http://zuche0551.com/upload/file/18037399216.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/63390041811.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2f9a82decaf94fefe039525a98c1d675/zikalor.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/bojadazijelukigo.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/saxepizupedazepomofufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+java+edition+free+download+apk+visionPDF 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_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 10980 bytes
SHA-256: 5c208bc0e7ed7e8eab3ca6458fcf9b441fc3f6b4eae26303cd3b1b83b89b204a
font_01_sfnt_off0001442d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442D 17544 bytes
SHA-256: 5d09af1883960826a213ad651eadb6bee5ee60f6f1a5fa8b23ab296d38ac62f8
font_02_sfnt_off0001727c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1727C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1