Malicious PDF — malware analysis report

Static analysis result for SHA-256 c773b3e4cd0e03c3…

MALICIOUS

PDF

85.3 KB Created: 2021-07-16 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 272d00d70744da6bf300b3bbe2445120 SHA-1: aad7985f057e4509e87efc32c990caa175bf59bc SHA-256: c773b3e4cd0e03c38bff5dd86f7aa8506b2e2cce1a0d403e731aa75ae20f2e28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+lagu+ost+moon+lovers+say+yes PDF link annotation
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/4cedb5340aaf57cfaafa84d3814d1ee0/folewurufegezajosa.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/julexinazokazusoxobutej.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd9037507---sofojidarevirera.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c16dceeda8c.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/xotafenijozererafimizev.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ad75b61---pikupugevepuriwig.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wafur.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nqtcu9tkps8najndgq88g89moo/nixukowefaben.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3bea5bdec---zubujenex.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/8761461755.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab7150279---lupesap.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/74115205729.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/74898945232.pdfIn PDF document text
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xakadujej.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa88a43a0---34960674828.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fc149508754b8960b248cd5bc1757d2b/96432573952.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082405ccad2b---41104397445.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f89e0912---62990496286.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edb497de8---wiruxotaminagatusajuwavo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3oqaiukhf2738a8ifj0i7tni4c/napaloz.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dubotisetasamodiw.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gazube.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f21613f3b---17872076263.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0a2b5936df78f78ebce5acc37f4c7527/xugupiban.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 17924 bytes
SHA-256: 6aae29dbb93e404bed16a9dbf15458d5e731e410a6c5995b62d8b34ef8541cba
font_03_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 10868 bytes
SHA-256: d7a922d8df2fbba5f2bb49f6c5f3fc240e3ff4d94afcee859a13ab5973cb0a34

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