Malicious PDF — malware analysis report

Static analysis result for SHA-256 230610ca18635b18…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 13:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b7ac7fe56822030ac5c5075d98903fec SHA-1: 4aaf1d310303d6b6d6b4876fc28d7d30c99b0af8 SHA-256: 230610ca18635b1876670c2c7f6938e4b6ea13ab50db9c55712b093921d7b202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=introduction+to+marketing PDF link annotation
    • https://botorka.ro/userfiles/file/27157438577.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zofizoxibomonisoxujudase.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076005b926cd---24709489933.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3419eda3e---zatujemupetutabafaviken.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/919e13aca6322e4b3d80ad2aa7c105f1/26143518160.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5192f01096---82715028410.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6ncohj5gsopajji8scces2rtl6/85829912566.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/wilida.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086aacd624c1---51206249609.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/duxelabulajosagol.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c057d1d5fbbc728044ff948b901c481b/40814512556.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lsijhfpkq69e1601grcnp49dp7/zulenonozax.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/lobawugi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/10fn109b0u7u7sn8rh4j4psbvr/nudumomojaxowifogite.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c1qqstshd49f8mtp7b3f5sfpi8/10753653272.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160775e9d692ab---vivoxudeduxagojirovatok.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4073c2b8---safubebugowijitozikujored.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcafd6158---51891818817.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nanojasizoxelobisofem.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/shcvg6d8s8v7kpvlvf2eaardi6/kewuniderutosib.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684d34e162---64263088085.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/65435678127.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1281db7b63b113bdfa9aed3b57cfb65f/92663956602.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hr9usn30hufcs7c3712d9kaqm5/95860060707.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_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 17384 bytes
SHA-256: 31e44bfc3e18031f473692c4b9c08e174c0ec2da92fee5b9581077ae38d25263
font_01_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FE 10644 bytes
SHA-256: 2b844ca69934365529d2a6eb81bb03cb61de167daa27c7f5dc0e8949a88170f8

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