Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc426872b1a21424…

MALICIOUS

PDF

111.3 KB Created: 2021-07-27 09:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 184ef971812a4dbb76f1878749f559dc SHA-1: bf66007327dbdf592d2c39ecac6fd5fceba8dc6e SHA-256: cc426872b1a21424f3c83e492cb75bf06e1483e068acb3e6a3a02dae7de9fcb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a6b97fb0b9ddcfa2d4fdf9eac80b256f/fobibison.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a725f0b9b0a---33092341437.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/765c1c05a7fe9413ec184d08e4696051/26866826618.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bd24255ebc6bb8b61f58118b696daa62/95807202422.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a90597fa---valobekukimikup.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b57aec6de9a---27311488537.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8b690ba9---rijejofenajuxoxeji.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725a0aa12d0---kazomuporuwosami.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u6sqe1ur6a5adnt305m0otfmcr/61515325338.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c5752cbc---rovaderubugatirabokinige.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/61363844997.pdfIn PDF document text
    • http://billsky.ee/files/file/peveso.pdfIn PDF document text
    • http://vejwun.cz/images/keniwomavonibigituzilimi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0f28b145---bagepobolife.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/23000557672.pdfIn PDF document text
    • http://vuason.vn/upload/files/82932326225.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/siduxorokadukakuzobi.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tilif.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/wodiwifawa.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/17269525513.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f4eefe779e4231b3fb8a5d88f897010/72966790945.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/vavodawamarobosesonikagow.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/67894735.pdfIn PDF document text
    • https://binhvi.com/upload/files/finemipexikuz.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rvjc3og9sg7pbclvcsul38i714/2990983674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=la+iliada+de+homero+resumen+por+cantosPDF 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_off00014d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001655b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655B 18288 bytes
SHA-256: 07b032a3aed96a5b4bb1a69ff06d067fcf0588156c74e656020e6212b77f690e
font_02_sfnt_off00019366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19366 10836 bytes
SHA-256: ae0545946e9868354693e54c7100c899d981d4ae5964c3ada5ddfd69f350a87c