Malicious PDF — malware analysis report

Static analysis result for SHA-256 533cf3d46a110b72…

MALICIOUS

PDF

163.3 KB Created: 2021-07-23 22:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d3f3ae40e27b0068643061302545002 SHA-1: 1f9180762ef959f2f02ad0f0c1c2fecfe99f189c SHA-256: 533cf3d46a110b724f6e941ea6faae92e0d11d0edfa486799f4c8de308f5e30e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sm5i6el5psre8e22hgjjmoiqd6/lonisusaratijiv.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xoxeg.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/subon.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/guderubexonefonidexefodu.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/luboverefopegoxej.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/db765346b41f01c7f2db7f3e1d00e3dd/ruliwad.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/5710319444.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dc5beec734eafe955d07019a0e5677fa/kenujutera.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tepavafuposerexejamifeg.pdfIn PDF document text
    • http://drironcat.com/images/file/konexezevupovowomita.pdfIn PDF document text
    • http://matras-devison.com/upload/file/82131789951.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcddce20fd---guniral.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/533o3frs636rk00dae3nf3c7oa/patipimovisudal.pdfIn PDF document text
    • http://evola.it/userfiles/files/sujato.pdfIn PDF document text
    • https://jotelek.hu/files/file/zedufizipipimilawid.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ef2b0a7---26193184131.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9f7ce62e466ed23a761ac7a877e74561/18330505877.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/48b1af5583e9a6b3fbc04cc760650563/numede.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/72d1c57db16b37559feb7d482dc082fa/64100055058.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9o4uk1ed2m45nqlvdnrn4f8ok/pututuj.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1a4g10csu110747dmh4sgt45b0/wojamazujebinivigal.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/55253702840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quadratic+simultaneous+equations+questions+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_off00021e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23650 11084 bytes
SHA-256: db2d48bf457d44661cc8074738619beeab82eae28b2ef2b06abbd10eeb0a0115
font_02_sfnt_off00024ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FFB 17716 bytes
SHA-256: 5653b2fd2f170ce2e3ba43cc4de3ebee1991ccb1e81a5117d8ab61cbaf4f8d8f

Open this report in the interactive analyzer, or submit your own file for analysis.