Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd660db90658862…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 17:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3b3a25102f0d10b250a4ad297979381 SHA-1: ae1eb250abaf6b97f248b2d6b5c0d4c9247beb8d SHA-256: dbd660db906588622bbb6163fde2e6c8e3b17a2f2f7680e347aeebf5dcbfe325
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which are likely part of a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm on compromised infrastructure suggests an attempt to lure users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5aaff34---kafopoki.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b9cc88bb138854de8b6d713889c0c857/dakopatipuwa.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/45389245555.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1fb6b858---47898379476.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f23df8ecf6c---nusawoduti.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/kitonemenin.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/tanepazuwedogix.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3348e16efd---dexurazewifikulopam.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vesefasibojox.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vizipojogoluvizemibafefen.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n84ukm0l9tl1pcd2iblkib4hva/bovonigojobuzomufo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/emg1fgq3uu2dj4rj0ohtujvcnr/765814221.pdfIn PDF document text
    • http://donghotam.com/luutru/files/nifulem.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/53acf127b7b17638e801a4ed32ed6fbb/77557238019.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/39697848265.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jenekuvokejexipoti.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9fd824728b1e8ebefc6d0812fdb7932e/puvirufakalerozesatar.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/57810364.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wimufebanigobulapozoxu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ib12g651dl50l4ptijhuu6dsum/pinolipagoj.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/xavemoxawawatodar.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/49356ff49465bac4992f499f5e65ed41/62929566729.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb09a8de6a3---relese.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1b5c67e1b7b5c4861e938fc6b9543e28/setevigusuxoz.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070b2237da---pobobonawolepujosupepe.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=word+problems+for+class+4+cbsePDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 17272 bytes
SHA-256: 683d60277a903ce6c2482aaeada900a1733c82b07f60c2ac6511ed68dad4ff19
font_02_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 10700 bytes
SHA-256: 2e6b620c5a9f4d880f88b732cb7cf395e50df4c380bbb4599b8edc4695540b89

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