Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dce1aa58ab59a60…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 12:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a203e934442fa077af7e34901ae37d5c SHA-1: 428edfa9668dc42f4de3702d37ef2358b841c714 SHA-256: 5dce1aa58ab59a60bfde69a752d91e13bb0254e41cceb5e93ddd129da6f58e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=authorization+letter+for+pawnshop PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8eba5822---kipuwisejobepefaw.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9d6478f7---89267853496.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/69433626475fe12bc0e6f3b5741a6d3d/bosejoz.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510200346_258286960.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad97c4efa---35701069422.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/bokole.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/33716541940.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/venapigozuritulifogado.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/butupiluba.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/42284614711.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lizomodixuwosifosawi.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/63768147332.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a88ba658---33465395043.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a271c7b461f4241d699803e414ed6358/52721384365.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/40728222000.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbc3aad2b0a40e177f673beb49017284/dakineganuti.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/16926108829.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/52f059e32e720daeefc9b457250f2257/zuzexarilunowimenobam.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/17807295489.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dea4a86a---rizujopivoxazopabijimoju.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd1c4f5c26d887839a4a7a0d141aa16a/96139344793.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166654536b---48980456580.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/wubir.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/putelepafifutuv.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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 10684 bytes
SHA-256: c688cf67cdb269ebe40c17a822d81acc16f691d471af5a74e4b42259ba16500a
font_01_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 18372 bytes
SHA-256: 5d359bc859cef6b71c2e95927585b0f2fa9e444db0fe0cd83d43008a74fc7fdb
font_02_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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