Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511069c3caddd09…

MALICIOUS

PDF

86.9 KB Created: 2021-08-21 15:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 69f6f8bb65c48b179885472c5b60262d SHA-1: 3c3dd9b97676fb8642b67839696800fb62e11bde SHA-256: 8511069c3caddd09ff780a865e46931159f9a86965a8168924860ba573dff714
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised websites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://grupahatak.pl/admin/_fck_files/file/gutovo.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4ahqa310pf21seoqtns6u01bv4/nilaririzafatowez.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/315bef05a786559478f85157cd0f95aa/9158346106.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/5674895988.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/kiweboxibubexade.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dewumabalawulis.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/lanunezijuwuzoxag.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gedawutavufajopemimirod.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/53926528367.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf89cb783---wivipepimi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/77377459670.pdfIn PDF document text
    • https://ancoraeducacion.com/images/68834246539.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/15545285496.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/de0325794989e247b4696759bae26b2a/90953006736.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/27421963958.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/57be04f9e9ac347a39c01be67341b53a/senadasewokegoparivasup.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6f477cc1a8986c4e7415e67eff1cb91e/21426113966.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/700008615.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091046838696---kasepemojezofuv.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/97596124323.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/dadetilutovigi.pdfIn PDF document text
    • http://eva.am/files/84c2bd73b30d6aab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=enfermedades+derivadas+de+la+desnutricionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 18012 bytes
SHA-256: 4f5d51643088fd551c2bbab7c00ccbe5e378c6ea1edb2e4fcb34ec8e91d17f44
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 10788 bytes
SHA-256: 481cc9106216472fd65793fe747bae65caef73729b47e25d593dac7861263202
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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