Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da6aae3743b1a10…

MALICIOUS

PDF

70.2 KB Created: 2021-09-03 22:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83a408e787e8bce3352efb5984a551b0 SHA-1: ad101bc628edffe3dd0ebb024c4d6c52c1545db4 SHA-256: 8da6aae3743b1a107e74cea90c0efc29e66305ae0a959fc95eacf98266fadbf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://irlanc.ru/uplcv?utm_term=brocardos+jur%C3%ADdicos+pdf PDF link annotation
    • http://al-bandak.com/userfiles/file/25487439599.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/15105031217.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/dupebu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/563680c753a12115797a072d9b4c66f6/suxunevaxunavup.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-8/20210608115505294419.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/df76c7e585dae4eb842c1517538c0965/95473615092.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/xitikuf.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385c9f2893---kitolajoxasebevawanum.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bf754b87fb1be44a470f512bfbfc635c/wudobavubawezisuba.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pigemafunigala.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jedupo.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/wozomoxokidalufotefuxav.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c3d2fb9a---56083826023.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tudanasufafaxava.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/wiladerosum.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/nigetowim.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/livikapuwumul.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1758ec1b2---diwalimonuzubotanod.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/99806915007.pdfIn PDF document text
    • https://icbacademy.com/upload/files/2726755502.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/18250450548.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3k7a35dl1acu18atn6ns6fi3sn/9673021442.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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 10576 bytes
SHA-256: 61a9a64055fa4359d817d5d41b7d86c15ef0c0d5cb9acbbbdb7490c8dbd2d93e
font_01_sfnt_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 16024 bytes
SHA-256: cb7353334f202eee82c397987286fe982c5a3580ff51013213d2c182d32a22bd

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