Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e360ac12733963…

MALICIOUS

PDF

94.4 KB Created: 2021-06-26 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4992f5f5142c18c6b40a71d4ebd87b7b SHA-1: 2cac2260ee403429bf6a9097407c08184333bce0 SHA-256: b4e360ac12733963a2b6e1a6d512c0ded6934ff7de613a139f05af4d72044c69
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd1670f08---10371703233.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/93108385b9cc9b4fcb4f0b50f4e246f0/13904924846.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22e203c435---mupudalifetetuzenizejo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wujetopogipavusomaluteg.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da7a69588---94245498186.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f2cba4f767f55f76b74cd258e4108281/zivinusol.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/21516331100.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/8b8hga18ad5uis55db5esc27l8/widasizemotonilolizudovop.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/23633563794.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/nutenuwenu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b9d6a693badf8654107985f4dbd443c3/fotiwolemewuxegusog.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/747a3d8c3c663873e88b681c4e333805/levilezoropuvobuvutuli.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7k9prrvo9vsr82bpo5pd51vfop/30860992.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/94464f2e53ab502df7eb7fc3419c8035/towujodogasafoperokaxobot.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xesewadoz.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/29pnm7c76gvi3l6l3jj8pcfgv7/99377784372.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/aphiukuv8uua3f2vlvv2tmq446/fomukajixiponugisexax.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bf7c9c5f---tesitebawofemumibokowe.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/befazilekixe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/26q82886nmnn30al2r3oh2gctr/67487575138.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c42eeac75f2d70dd93205ec996c2b76c/31695427345.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/88cfc53659f21a2555c9b31e370e45f6/galipizidasopipukike.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607547f92d53f---98458236029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=if+recession+is+to+be+combatedPDF 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_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 17412 bytes
SHA-256: 3cfee5db4a7a765f5ce2a53118d87ddbe781143f455cd260dfface961c1979da
font_02_sfnt_off0001522f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522F 10684 bytes
SHA-256: e10ddd63c004f589e3ebab2478e4c364527c1b83dbb9d088213943116deb6654