Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6f82cc53a37c02…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 13:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3451a1d8f599977d46e3a21889d36968 SHA-1: 255595e3b2a6b2a0e721c8a6e6b3d1c4d8e135e1 SHA-256: ad6f82cc53a37c022cc5f4ee484e69b62b239987861e55276102cced59f1cc0d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or are part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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://brunagabriele.it/userfiles/files/91893157168.pdf In PDF document text
    • http://steakclubhn.com/campannas/file/xopafimazozojikuxo.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/35954486539.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/dixatenokazabo.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/81801275663.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/1240252046.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/216019192.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da81c8b2ea---84446016514.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xiladibe.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb3300d88---rifularegumawabusolase.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e66bbcbfa380964a86853820bf9f1374/98031767224.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/piwalom.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/liwewagek.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/njqija1jtq19lnamic0st540cs/73660767866.pdfIn PDF document text
    • http://usagimatur.com/files/others/87864409970.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734305e6335---fevolovok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ohj26chv1cjnm8n6vj9jec87u3/raweserol.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/wexepufep.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3504d9ea37---lonebezeno.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bf7804cc---kidotiwiporobovojedod.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/59124783631.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774911c49dd---81481313061.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/19013806609.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jenogemamawajapazizogewor.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/sivubukavonaxo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ebonfdhmb4qq99qa05ffpl47ua/23174641791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+do+a+biopsychosocial+assessment+social+workPDF 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 11200 bytes
SHA-256: 22a8d4b5fa6521764d7ce4e6450dfad16f5825a241752371f392120d70374ce9
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 16528 bytes
SHA-256: a735e66beeb90ff31cce91fe0db68aa628ed702eb8c805da2cf36ce64ad817b3
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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