Malicious PDF — malware analysis report

Static analysis result for SHA-256 61917d87cc42ac45…

MALICIOUS

PDF

70.5 KB Created: 2021-09-01 01:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09f2c1f7fb1e87f1118859a18ced85a4 SHA-1: 49210891de1ac79edb5d0ee3d8baa96b6615ff0a SHA-256: 61917d87cc42ac45d69222b9d6b22e94c87671f391a10d7114dd1ec7806b5e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous links, many pointing to compromised websites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://101balkon.ru/upload/files/6437893264.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/zirugagegogeb.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/39015904405.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/duzibisisujidok.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210605164315.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8eb2b0f7f5cf11438670cac1a9473b59/rumuxedamekasusob.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2033db4e37d1a96403f1e75151e84b2a/37466730892.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7a826c640f68345f534b81016153b0ff/33439751540.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160983134666f4---kevavuxediwekoporobumuxi.pdfIn PDF document text
    • https://angkagenap.com/contents//files/76113911075.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/67857740463.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612194c602461---purozugekomoxiwer.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608118e206037---60936522084.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a74a1a796f0391f0f7c27e92b6c8d93e/25122514330.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gufoxan.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871e55decd5---bilidutibapi.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/saxilumowi.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/66248239421.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7b7bed3adbd6bce6e812b53df93e267d/90434444803.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d41a2c0a402f2d1da560568e9ee00fb2/98871162917.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/b7ffb0c467e3b0de8cee9800d6d49feb/mamilive.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/7306695908.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/putomir.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/85893407092.pdfIn PDF document text
    • http://splogservice.ru/content/file/posixowivujol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=file+converter+pdf+to+excelPDF link annotation
    • 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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 15480 bytes
SHA-256: 5e5159e60e8d3e4f3c18aba92e5562caf90be10e258f3d51a4bb218c958dc8f8
font_01_sfnt_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 10428 bytes
SHA-256: 6f09249ade1529bc2319e0d9c33f47c263748136a359fef4d819bee006662a06
font_02_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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