Malicious PDF — malware analysis report

Static analysis result for SHA-256 3461b39f82fc8d70…

MALICIOUS

PDF

78.5 KB Created: 2021-05-24 23:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ea2be50504b14e71a38462036208dd SHA-1: 32b6e93684c6c28b0c75c5891912a4653d66efcc SHA-256: 3461b39f82fc8d706238d5403e9f0611cdb22176e060b9544bf70893d7a16f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of these links indicates an attempt to facilitate initial access via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=naruto+x+fem+kyuubi+fanfiction+konoha+bashing
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/65040891654.pdf
    • http://aitrans.org/UploadFile/file/F1202105221726281511.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8415fae9d4---53255228153.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4htp253l5hc3akephaih0ato2k/tebagof.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087d331a3724---41153130815.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05ee548b6---sexepotagepusofevigovez.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef5182bc30c2657d099e35ba61847e46/popubilafugudebepaj.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/jcamkooj17vn2lt4qoeuhce822/simafagobatelixaje.pdf
    • https://aduanaldelvalle.com/userfiles/file/2570114672.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7bbnkmfkephgtbc6doe7242c5/6469869664.pdf
    • http://tuzvedo.hu/elemek/file/vodutaniwubi.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04e2f4011---63129846101.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3e9d741ff049aac9e27e1c8a7d1355c0/5064118229.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ba01c8727dfdd3f024ac6a19ac9781a6/93559059878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ff.bin
780676921cae48e057084177679d1f55ecac5cc749f1625c337a3318f5d8e1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5608 bytes
font_01_sfnt_off0001080c.bin
ae0dcb53d8bc41cd6ce821d589dab35b90c2ff71644cfa35234f4d66d2a9ab93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10920 bytes

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