Malicious PDF — malware analysis report

Static analysis result for SHA-256 c369315880254937…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35cfd7bbb356077ae7aaf9c78ff9cb98 SHA-1: 81e78bda0506f3fd6e269a4318f13806e3689247 SHA-256: c369315880254937f6fffa079aaeab1be6f38b8998027063c5045c3dd1629e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+maze+runner+book+plot+summary PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b8981f1e---60949004421.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/vesoxajapazonebedeferu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0468145ee6c8f8617ae03d40bd1adc52/musem.pdfIn PDF document text
    • https://inncredel.com/uploads/bunusonubipidubijamefaz.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/67223220406.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mokowulu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jkpf950m5pt9qpe6m6h34t4kkd/18280960952.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70150dcaf4---jedib.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/40344201236.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zajuroberenogatixazedo.pdfIn PDF document text
    • https://euchebnici.com/img/file/74916508008.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8k2iku9rgb9jod3chq8jgr5dor/47607456891.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/784204117.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1277af35a---42106652842.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/70dc0166e042342e72dd627d3a86db55/67988539388.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/53150648778.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fenaxifutuk.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/9602675691.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/3531045970.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1f8b7047---bikazurisunovixug.pdfIn PDF document text
    • http://sgpeo.pl/users//file/58928130505.pdfIn PDF document text
    • https://edgecs.com/documents/10832075140.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fofarawiwukexax.pdfIn PDF document text
    • http://thedreams.cz/files/90175059321.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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10892 bytes
SHA-256: 7986001c1f81caa371b80c51d75c21e6b9b6060c84728ae0f04d8c634fad2403
font_01_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 17456 bytes
SHA-256: 052c4b4764a3ccf100c8460132fcb7559c8a1774534526268b0525a1822d7858

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