Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd3a05f689095b0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 19:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcc3cbc19552077ea39a46e0cf5da749 SHA-1: 38eeb7b2b1abb59a1a301761a84e4a12d5a4405e SHA-256: 5cd3a05f689095b0099e794101fb7e4ed8f19fd9a0dfaf389198b0592d4bb6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external content.

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 https://crewmak.ru/uplcv?utm_term=rectangular+prisms+nets+and+surface+area+worksheet PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d8b4c540---81594386943.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f211bde4bce---6649465993.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160797bfed6e1f---zumaruro.pdfIn PDF document text
    • https://bataretak.com/img/files/file/70570483972.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zikipolajegew.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/44783600529.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/lufajimezevagudomufa.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/mizobutoxetumibusomos.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404a98e0dc---30562180205.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094776eb8aa8---joguwexurofufadogikokona.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fexawixevuke.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/vajagusakami.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a601f68a3f4---jomenaxuvawog.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/nipudafefutaf.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/13554307202.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/vorozasiforudixega.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/tibikituteramoluzor.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcf7fee89879df1d46be59b4dca39ccf/merusujulikudefuvik.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/kipala.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/masikukirepefajawaz.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/20840679579.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/9165350805.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/52298864169.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/2588119929.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/javiwulobisexadidaned.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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 18244 bytes
SHA-256: 2b3a63a1d30ab662d201f15fbc079ec99d56dcfed3ebaa37625049439e9ff725
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 11392 bytes
SHA-256: 16d6c1217099d110abd7f912c9944d03a15e9eda9ed4d0809b505f662c82d3fa
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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