Malicious PDF — malware analysis report

Static analysis result for SHA-256 de60d27c8ac40bc4…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 23:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43107e6f2d327bc1b2abdd499b1541d0 SHA-1: f0f0a16da85274052c0089e32f387d7fdb49cab0 SHA-256: de60d27c8ac40bc470ff04564ca00ec740d9132d8f5baecfb1b466e87a61f3ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to numerous domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dgjst.com/upfile/file/48581235091.pdf In PDF document text
    • http://reelproductionshd.com/userfiles/file/jonetimutavaparawog.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735196965a0---napuxuwo.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/vufojino.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/wawukomutamavenoraruropil.pdfIn PDF document text
    • http://df-2.de/images/daten/file/dudumiwixujerisopixiduduz.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dusenobas.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5c95cf250f92efc79b8647600b01b55c/fojuruzikowisoxivok.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/kokukipobamer.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eo9as6pi8a5t0kg5fr4qlq9g7b/penavosidukok.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609413958ad30---10590616782.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25321859805.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/34497950453.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/03e42045ece0cd0853894c80da1a29e9/37457212560.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/478ab784496596be5f90327493026b8c/48414296364.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18fceac26---wipuwazabiles.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/41472576162.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3a78d0ae---65447576602.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tanosowobezemakexo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/85592bb26ca6b72e8a4076f8cfef15be/85894610033.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabb5d41b7---72359956781.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/guresufametugapoxupebum.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28be73b94---lebikafatigiforosuxovi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e7e27546---wifukujoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+draw+a+person+looking+to+the+sidePDF 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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16972 bytes
SHA-256: 2874f8c3790e83e9eb0d15db19fb42d563f235e61c9cdcdbba2cb87a83e10e9c
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10840 bytes
SHA-256: d59bc48b4730a1650094e7749445a8ab2df2710b2b4efdaf472ee9ee008d0229