Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58c1b4b2605dfbc…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 23:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dac3060e1fd9fd462dfb4466a3d06d4 SHA-1: 0ba4290c3e681dbfd7ee8a86db52543643b0eb3b SHA-256: e58c1b4b2605dfbcc80f14ac8ad6088111ab2ba61de0c3431680d7f383c2dafa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the presence of a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7325a436750ee24db6d4383592406367/24031028546.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5d060d457a29b42e5dd38c92a830853a/6973443135.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/59260283842.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/ximapasilodon.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/37113119053.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/9ssru2je58ib3m5rsh2bn7nmfp/sodurak.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/48920393612.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/40c1117222a0cc5b7b641d7fff28cfe9/5766183836.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061519080173499.pdfIn PDF document text
    • http://dentherapia.hu/files/file/poxiw.pdfIn PDF document text
    • https://ebooksweb.net/files/file/vikasinusadaloduliledik.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/57f835d3c8cb77dbcce3d8366544f984/59330808343.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zesenenovu.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/2536030060.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9755a0f264---47959888056.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t5ngede34batsh4o3k7fim1ish/vuwidagagajitavukaruba.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ss759s71or375iose0v9iha2tc/87717786692.pdfIn PDF document text
    • http://keacg.com/upload/files/lufelofulazukatufojer.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/35291120358.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a6d881bb72b850da93c695c3b4c63c34/debujiwiwubetatodeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=synthetic+rubber+monomerPDF 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_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 10548 bytes
SHA-256: 8f7b452206944a41214a1eb037c66a11b26145864c76780afd03f96e7664b770
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 18720 bytes
SHA-256: 70e107dc33e8ba308ba528b63f9886c2e5a47b826168f5ebcd9fdb2c9413b70c
font_02_sfnt_off00014656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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