Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c39aaaf2bc94ede…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 08:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 485b2dbe9f9ce2c846fb5e479f832f85 SHA-1: dd4239bfcbc0f38817ea11986a34840a2aba28ec SHA-256: 0c39aaaf2bc94ede05d8bf730fc18b748ac4d72c61b7e2bf9e6a2da77aa62aa3
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 a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=kumpulan+cheat+game+android PDF link annotation
    • https://icbacademy.com/upload/files/dikuvuderabitufawukuferu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/25351291881.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/2453608859.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/r16ac5gdobqldkpefagihprdcg/ronelakavexodigazugo.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/90944513087.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/84388211936.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wemarabigevimuwamewavup.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/talotalivuvumisejosini.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kefuj.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8726999ba---wefimepezunirelunizum.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/33125785362.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/94898287649.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/6549245921.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xoxif.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/79733537954.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/vezuti.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tenonirogevabutinusup.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sokemimamowox.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kogasopuladiropoxe.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/26123942709.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136be8a55dfa---11529877518.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wudadibibulujusowilun.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bokutewuxijipuv.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f17170e9---41475594564.pdfIn PDF document text
    • http://prosquash.by/data/vasojipazat.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902183111.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/9633571557.pdfIn PDF document text
    • 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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10884 bytes
SHA-256: 744a40a6ff14c97c7f93732e1f620b905476f6a1c747088fc6a63270575ddade
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 17912 bytes
SHA-256: 7efaa45ee6a85d4fa24319825478113795a4f4cac89962b49f15524d9409cd54
font_02_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1