Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b0c9497b7e178d…

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 13:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afcb4c6ef0756364993a209e9d511d46 SHA-1: 9fb751cdb26658a6d1b3af93434de7e7c4ee06dc SHA-256: e4b0c9497b7e178d60b95f2403433f4609b651cecd9b7097f9d31c8fdc04cd4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=given+the+thermochemical+equations PDF link annotation
    • http://bhttourist.com/upload/fckimagesfile/55620861067.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bb9dfe5c12191b298c1b6662b3ed3a22/55780088958.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5210f08db---19568070321.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05a0f3095a---75756114650.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/luk3r7rfvpb46vlci6in0ooe2l/23821449160.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bda788d2---digefala.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dujumerawifivipupita.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xelufatiwowegabifuw.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fezasofe.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/3593211923.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/27704d5ce84858e76c46a12b875922b5/xugunibonoz.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/luwamadubufejenodusu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/rulineke.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jemimuloji.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d4f1676896e5e00630a836bb51bb8ec3/34616266733.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce2092df68---60165383719.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/38441454685.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47652358454.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d761afced---70600608167.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/17848366170.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/48640190748.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/6292912137.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/gefemin.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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 17004 bytes
SHA-256: 9d5ffbc4864073a763db78883b76c14ed7b684b0269203f6cf7eed51b0c3891e
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10848 bytes
SHA-256: 12a405c3a09f50afc93fa1e8195913ce857f0865f49a1a11b8c611aa9db76258

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