Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7710a24c356c20…

MALICIOUS

PDF

86.7 KB Created: 2021-08-26 08:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fb8ee63aa35d8210137bd2f057048e1 SHA-1: 3afcf9996eae09ecea0f95657bf7b32e4118772e SHA-256: 8d7710a24c356c20bb04f868f5657543697a6e53271e11e707336c0f0af6ec8c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/773d2fddebba107284cd72735e36c7b7/22600497433.pdf In PDF document text
    • https://panama4d.com/contents//files/fabegadoruwetakubimixu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/gitoluwiriki.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/72004939527.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/923ba7dda38dfba582b5714a6a4d43e3/ginogub.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb57c55f---kawumibaluwiwitumivulopug.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zabosixezilegavobumufado.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b908ccc9295---43524853512.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tilixexabonagowatetel.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/63333178150.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/74784607169.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gvd0b2ir0btit83rg3fkipg6t7/parejoxorurataxexuwijiv.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/knvg0j27bm33rj4clb989j7at9/56179191139.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/51534830157.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c9300575d---daronekuxuzafuleji.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4abb6748---1577349593.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611423e4ea0bf---numinojedazutufapavex.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4264a5e970---2395557362.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebe4e6876---42296227124.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/4839792662.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/52224505876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+ice+cap+type+of+climate+is+found+inPDF 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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10960 bytes
SHA-256: 16e6eb1935f0e987539a7e9d9e2a36067d285b35d91c74e940a5dfedba9a8c5a
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 18308 bytes
SHA-256: 19ae3df720a104ebc3523d5584b69de3e721fc38b8682e1e23201bc66ed150ff

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