Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca899ca8a70394f9…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 23:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bcf855aaaa0d5dfb8f78c5e20f9b5ba SHA-1: 5601739245a4904559ec5299dc411e21990af8e0 SHA-256: ca899ca8a70394f9a667b4de9bcabaf62e02c379119e3e475874f202b08a1772
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with many embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of numerous links and the nature of the hosting point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sunriverps.com/data/editor/file/kipotipeberasabixebilomes.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021071310210773499.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c22e656fda0e786bb1c105549300bbf2/21735523669.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/fenabodedatigane.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ujpm5up9t6ana51c04dgpcujk4/29369773909.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a4b5b894d8af94586c6a5138b78bb304/lepigujavoletude.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/pepetowe.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/tifitituk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f6fbc083---dadobutase.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dagilekerida.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f3b9e9f---bujameraroduxabozeriniku.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/82798603272.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eebe38e06---87462187073.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/9686148153.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b3cea0b---deziv.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f010129d496---42188314610.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/89891e6b7fffa01938bd80d583e1b025/56533102315.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697b78994d---jutudeju.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/mijolu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d07fud0ib6k53n7hlprg5df3o/69883148476.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/144d43814096562d0b0efaa17efcabdc/sewixelino.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/zuduwusezafufisezawu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0c49575c27f2f421415cb95043fed244/61052021361.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523220126105297.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1ec30b314f0bb199bd65b8672e0af63d/32912986858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+thief+the+cook+and+his+loverPDF 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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 18956 bytes
SHA-256: e631c90cb87ff6569c5bf2868e6e2b1355e82ae973d87da3da2aa7fea182428e
font_02_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 10696 bytes
SHA-256: 63cc468e3a2d903e12ca186fee957c3d70d44fc477984aaf079f7d8ca62bd207

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