Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eb622c3144f5d7…

MALICIOUS

PDF

88.1 KB Created: 2021-07-25 09:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c4d7eaede0692e347888c9db69cfdcbb SHA-1: 010f1bd96c03a4d4b886889ea6fd20fa6fd4c929 SHA-256: 21eb622c3144f5d70baa64efb330c988cb84f8e7c475cf0d17f2f00f828bdf36
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains multiple heuristics indicating it is a link farm and a password-protected archive lure. The presence of embedded URLs, some pointing to compromised CMS uploads, suggests an attempt to host or distribute malicious content. While no scripts were directly extracted, the overall pattern points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanuneke.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/58847237145.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j5c9qv3f7mgj1lnn4qguem3mo2/genegisuxizopisu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vesotidosodofowakifotijo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3b722441ad98cc76c39fb33ec6ead5e7/bekabivig.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/75019643929.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e948192c2---xozis.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/53915008152.pdfIn PDF document text
    • https://actorconseil.com/files/file/rexavojedajatinoja.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d60883add---84006948277.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/kadobakakuxisogodujot.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074200dd6a3f---38105335437.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b802119369161ac7632b4f16d16bb412/36934719215.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///89723270188.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/56272378852.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/704f24e7638cb6d77168117e37cb7625/rasufivijop.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xofonoxapowulewe.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wetabamenuxazewotidofevij.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160809a6e170a4---76395694128.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/87c94ac492584587f534ab585cfac30a/sidizalozajefubodekonon.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e9f1c26---98850898564.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/xogogefozuviduxefu.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/11097198154.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784da123073---kinifamagek.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4842cfc1---81226947678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=alien+skin+eye+candy+7+license+codePDF 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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10400 bytes
SHA-256: f51da26d639f3eca3a92d0803b61eef19bcf14da69c508f6a65e54dfcd1977ac
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 18380 bytes
SHA-256: 6ae3de91b5f516cb2a7ad5acfae9a88327ad24932db9574d618e6b39fd6eef6e

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