Malicious PDF — malware analysis report

Static analysis result for SHA-256 58daa525a7eb3841…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 14:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ccc3c0acce579833cad2c535f769fb22 SHA-1: 59c9647112542e59a7a8be6c50664ced3bd0aa28 SHA-256: 58daa525a7eb384152a41677765fd29af17c3911ef42766911920f8f09f6b0b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings further supports this, indicating a tactic to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allmassage.net/upload/file/20210526160713.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0362b2cc2---18197973200.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ve8lg7olbofsdv5temjheqf2v0/gabonuru.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/92387794221.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bi15cpmpiuvcovra2q4gfn2n83/sezabojabat.pdfIn PDF document text
    • https://ivanamihic.com//files/kewipuxiv.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r55vtri66o95dd25r48b30eafb/dexubagufilamexosisasemuk.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/94393611648.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5eedcfc287f3a644e858f4388a81f170/vesopuvugemurisutat.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081646885860---donurelexikelad.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b01dca5da2bbdf72e9dfd926f0afcb2b/kekefajaduris.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c85aced0b---vajujokonufef.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/86755448902.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4eda4fcbbf1d03a697345c028269b119/legimaguvatafumipedovu.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/turefaxu.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/mazasotumaxofipewokunatav.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385f3bb7d5---mijofotetovonawurukumugi.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/govusimozunenobe.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdeb62131---60660255765.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef954dc40---72059151271.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5477ddea---kujakepasotixutejotaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=3+3+practice+proving+lines+parallel+form+gPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 16132 bytes
SHA-256: f8afaa9fdffa34ba0e7a9beb9b8bcb5ba3e4ef8734021e1aeb46553cd1b9fc3f
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 21124 bytes
SHA-256: f64d47bada792f0b08bf97e20a13d15da317261fe466a3508aff0266616bfc5e
font_03_sfnt_off000158ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CE 10964 bytes
SHA-256: 028e095bb07ec8105c9eee589575b5e74b3c7f6261e6c3f074d3ffe3fefdfefb

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