Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd4a8e9c134ea03…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 16:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7c28394beee1ca47243693789f9b363 SHA-1: 6182f5fac4995f6a7e69af328d7e8f7608bb1d9f SHA-256: 7bd4a8e9c134ea03bf6b4bbfbf7009c539b5a3874c246a7c7d60a6a07df1ea49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The numerous embedded URLs point to compromised WordPress sites, suggesting a tactic to host malicious payloads or redirect users to phishing sites. The presence of external URI links and link farms on disposable hosting further supports a malicious intent to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://allytemp.ru/uplcv?utm_term=pdf+file+editor+ubuntu PDF link annotation
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cece3c139e---34844593395.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/92a1243d0a460f87a70c9f5c8f138c33/18097814664.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d65b8ac9412aefc795ee7d4c308fa1ca/tijidepuna.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083721ee5c5d---90971315228.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4f908c6de---54617188881.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f103c998fd---53463700694.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/vofiteb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/65cd478fb79f36c653e76679e9fb2aed/11857067427.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609407fbb9ed2---sumagu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1af121f411b28bd266c03c5069687825.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b387c0c26---42274626350.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lusasegupizerapipo.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/gulefamoxalona.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce021d57885---pemipigogemazumogukupet.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/da5c11e5576c0783679cd457a358dc72/bekokutidezumuxakuzojuja.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wedetejuvemofikokevisixug.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20217101491975.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xisax.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nepatitobagarolisijuzoji.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/837374373.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/woziruregijisadipukubu.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/jotomefigenajevolev.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2ea39b3c---55349962977.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4637faea6d---bozutipo.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/89556583205.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d1047e419---vesega.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_off0000be22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 10260 bytes
SHA-256: bf906afd000e9d39cd1a8703b7b98332c3a789271d02665a49fb0d09d006a4f1
font_02_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 16180 bytes
SHA-256: 2cdbe30389cf704dea166f93924e53194d065935dec4e5163de5b4eaa5d9d609

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