Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c5e5e80d0a9fb…

MALICIOUS

PDF

82.7 KB Created: 2021-08-21 14:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e195e91afda1fb32e74847421fb8b510 SHA-1: 0b8fde79f3f2347c51b1c06c3b20939be9fdf7d4 SHA-256: 136c5e5e80d0a9fb0028500201d1ff2e66c01fdd2225c8840f2af1448ee1f947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catamma.ru/uplcv?utm_term=alfabeto+en+taquigrafia+pitman PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/turunesositutev.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fiwukolerizifa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a404bb501a9---fumarovujavekopeberujo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4184ccd2---65091538093.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nenisesebelimu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wisotima.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/87846658899.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/1814895556.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a06e80f21---81505106564.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/90341389820.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9945c2eb---34970318535.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ab3936a5e7eb61e8bb3200878d99a7c9/nulorufuzakanezezop.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c1225f5b5227454480b3dc866ced427c/54688137618.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/fesevepifise.pdfIn PDF document text
    • http://vtaky.sk/media/file/25391337139.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/b06r51c1ivpbf2bakafvb4af8k/gifoxugidusekerageban.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5b9827300296ed9b7dfca3230cd9379e/51787232903.pdfIn PDF document text
    • https://ovalpolycoats.com/media/gusujuxozatanumagegatu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/3547092067.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fa41f258ac22e27c3280fb09b7fa5e6e/10725451178.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fbqg8pnpqp5fbqqdvf7mhbopgp/wizukejewajuk.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 17800 bytes
SHA-256: 99fef184d80b07a97517e18a786c92d49333aa07746aa377ae13c7582af734d9
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10900 bytes
SHA-256: 8560ab19e40fcec93465e1412c17a7a29091dda14279b63a6c4f463a8884c31d

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