Malicious PDF — malware analysis report

Static analysis result for SHA-256 615226ca9ef632a3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 13:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38251a0cf18ab0c946f4cfa1c6ca6242 SHA-1: a529917a30f1817eb40ac7f82d6f60d8b74074c7 SHA-256: 615226ca9ef632a37e4b4a6a939647e71d7a7fc37621ac5cb09a9244cccaaea1
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, including WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8895627ba540c0b77f74bfc09d42c624/24375324571.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/jibevesofunibakowobigik.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc68cb79c0---demipurowewapokudewi.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/75987410759.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608627278fe14---31844050439.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f76e326c---gozifasi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pmadk28n7hc3clvttdu6lid761/46188161790.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9212a134f25b0e3afed23c3c58e50467/44277372233.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0ef396f74d3cb47cfeca521bcbd9ce67/tojowikikamazanulat.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t3de415irk71tucja4etbns5uk/74776960608.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010525276767.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f407cbb71a19f468f0e8bf31b3b99b81/ripaguxibu.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/83556059998.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210828_151808.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/56f2a78a5d0ed8909141d7719ad674cc/razosamazuvademikon.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152139552885.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/94227173059.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10ae6a710---vudebomebefesusir.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd579cb197e---werolenoxonodewadinew.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b2e5058b---vuwisi.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/59899766916.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fojezevuf.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210825065714.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/fobabiwebajiwopovunax.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zumubakoxilewunamereresoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=computer+architecture+books+pdfPDF 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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 11096 bytes
SHA-256: d2d907af7742f126622889abbabd8b58470a50726c2f10760cdd692d4c14a120
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 18416 bytes
SHA-256: cdfaa602f2da6ecabdef1dbf9bf6b599cdde3f788a84a9f85cd91aa2c9ea8944

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