Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd5f14a97c505c9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f02285f69b1ec042937534e1349a3a3b SHA-1: 206ea1d49dbd4bc7133fe51b85d12d0d4b084210 SHA-256: 3bd5f14a97c505c9afa692cfde27eef8bda16aa049f25507ecf9e951100127c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://targhevaticane.it/userfiles/files/45507778177.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099a305d5703---8442923159.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/aca6e6113eb376ab846fbc3553038fd5/tedovesurapufuj.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/8894861360.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/pidazevuboxanimuvaxab.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sivovuxijazujog.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d18f042f6---43143394342.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/46693597300.pdfIn PDF document text
    • https://digireg.se/upload/sidexoxiwufetafap.pdfIn PDF document text
    • http://nineslash.com/user_file/file/jaxujimiv.pdfIn PDF document text
    • http://dezis.ru/uploads/files/96398002450.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/15595410551.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fcdbd1614---15608434363.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/3507513496.pdfIn PDF document text
    • http://riversedgefm.com/files/file/80522973662.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/37570400378.pdfIn PDF document text
    • https://electroagro.es/pub/files/sipeze.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/52586927297.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/guwimovutoginejef.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/34275045340.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/84426478277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=modern+condensed+matter+physics+steven+m.+girvin+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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 11260 bytes
SHA-256: b20440ab795e47e0c9db93d297944fcde9badabda430fa5ade0449bf53657324
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 18004 bytes
SHA-256: 9e003bdf9d11b9445935c50704430d22cd839f3b92089c6882c7a200d445fc43
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1