Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f55d57187e023f…

MALICIOUS

PDF

92.5 KB Created: 2021-08-06 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b46d421677fae33d4988c6f749ddd130 SHA-1: bce163136ab9c42c2d453ba4766bb5b4ead892d6 SHA-256: f0f55d57187e023fd5adfe46154de868703b609697faaa34b5c181877cba6a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs and the heuristic firings point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=science+magazine+editor+jobs PDF link annotation
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/fubugemikukujajoruvoz.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/wogukeg.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/efd769a0abf939e176bde34a07f58a16/zojijexidapoj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/j77m3049lcc54ik8056adkita0/pumiruminuz.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tetikoterawonowera.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f5bcc51a---9031935283.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abbdccf1a5b---burezigobukawifog.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fuvejopoviziw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbce47c4ce---detulelototozugi.pdfIn PDF document text
    • http://tai-group.com/upload/files/navixekotizopugazesiwizij.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4bp5776682qmek613t4tc4f3oi/lexozuziganon.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21989673f---57786373353.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/b7c995ac8b517e12dc984803426bec7f/madijez.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/wadefoke.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/36122662204.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/27334270474.pdfIn PDF document text
    • http://markone-tools.com/upload/files/39042416698.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/gisuwuvirejoxowu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/906a0525cd8ccfe1945ba117d7b018bc/jamodetepepawekiso.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d3fae4124f31ecf7fcecfd05172b16da/zesolij.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/3ff0109ab28eec6ff39d1d3fcd40da51/dakotikifojot.pdfIn PDF document text
    • https://actorconseil.com/files/file/69042827555.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/nemofitis.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da271f31d02---nowipubakawezolaraboro.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c97e259c5a---85471903404.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ce0231e0796a91f318250146f8025d06/dexexifafiditu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9f1498e977dde1e90737db587d787e59/66486135691.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_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 19560 bytes
SHA-256: c0fddcbe0dd29489cc647b6e5071935d25a26917692e2f0df65ca4c3ef778a84
font_01_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 11072 bytes
SHA-256: 81d800a87c0c146c4093dce8137bbdacbbf4a9aeb99ae6d5fce51f8535973d2e

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