Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcba2817ee3bbb51…

MALICIOUS

PDF

95.8 KB Created: 2021-07-29 17:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f015cc007a197711b338c23c16015d3 SHA-1: 5730253a6e925207bd432e5cd52fcb50af6de027 SHA-256: dcba2817ee3bbb518f0c2c4fc1329f55e0593f6a2b82bb5a2fcfa9fc447b6f6a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The embedded URLs and the nature of the heuristics indicate a likely attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7u301a10p2mjhlb90tbirbd4u0/93374157942.pdf In PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/mifob.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/zekekukivosabeta.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491b2c7537---rukarokid.pdfIn PDF document text
    • https://cecprint.com/images/file/15395328543.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/47076646103.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/35188826665.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c1dc2bfa---karumasikonujajizifojami.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c1226e7f02664293e9e56b8cc6184505/80221029881.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/95e50e5afd2d5443b28ea8d6c94f2d84/gemijajenajegesob.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5901b0fa---bazezosiripuwajufepupap.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/simewevup.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/68876560035.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/60171743987.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba75c8f7b---60348480358.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rofobajipoxigexino.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa70b3f69---lalasapepusi.pdfIn PDF document text
    • http://herve-coiffure.ci/files/97409281535.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/54517581651.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vu2ajgos61n6d80t9mlooqbbf2/pubatidugijakezovafodiluz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c0c6a925---viwogegamegabenijepunex.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30b15040d---37296204812.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a802e674ec8757cf1f3ac9c937a05d76/33741664264.pdfIn PDF document text
    • https://12shio2.com/contents//files/sobigekotepevafidulax.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2a637ur6jt52nun5m65l0prguj/56946764206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=max950hd+addzest+hdd+user+manual+in+englishPDF 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_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 11252 bytes
SHA-256: 84ffabdfdb27cd7a4edd3f37663ce88ebb62401b1cbc9c709708ecf4c4fd267b
font_01_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 17612 bytes
SHA-256: 5c888a8a5c9b2db5e3f7de44acdf63cf4cde1b94ce1d59a36f483b40303e41cf
font_02_sfnt_off00015675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1