Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a80b904bd4e032b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 05:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca6a5552cdbe3c49159cf5f59c94df81 SHA-1: 5ef0a23a7ae1693698dbfa8c1c26a865e3af5441 SHA-256: 7a80b904bd4e032bab8014833b3bb19522d07ff38f7fe6de83d72fb0b18c9dd2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded JavaScript, though not directly analyzed for malicious intent, further supports a malicious classification. The primary goal appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://linza-market.ru/upload/files/87352319816.pdf In PDF document text
    • http://speaklifeiamgreatness.com/files/files/nubaguzovewevutopinod.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9216f61cde---66568514697.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rhho4sjghiqmfsglqeqq34gsk2/nuvajuvorewufuranuvi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/dejev.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7f004715d5fa7500ed5118949e6c5c0/dibezufavino.pdfIn PDF document text
    • https://yifff.se/userfiles/file/butodabulufodowaro.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18874305025.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/89269940000.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/kidudijovarene.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/1445496886.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0a8713aafea385e6db9f20e2ce224354/bajesikogurizuravapev.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/a8k7t3o9g9pd5thachquucttbh/7383013779.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a118d91c32f49f0a85d03ddd7ae13b8e/14326384357.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/basemigoputuf.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/godopagumuxexipov.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/duzuvufokemixaxexaxim.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714749d4739---zajom.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f013b27a1f8---wetorokixifunuluwis.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/xivak.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/99349499303.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/27873716296.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8a4f5d855c5f228d4c07c8aed1a62176/29116050743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tyler+henry+book+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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 10384 bytes
SHA-256: 879727cff1e35f62f36518c942689b49b76ce1722dfd373733f1a09cc25097af
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 18276 bytes
SHA-256: 1fa3dfa5cd0c5cb39c16f2b2a00b4408c2221e491289fb52d321d09ef3c20a14
font_02_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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