Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b29dac7d96f37e6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 21:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89a4ee114c340a5a6ed2021324b52b1b SHA-1: 3e93f1c83082298d9182ef140f4b374da4eeb540 SHA-256: 5b29dac7d96f37e63fe14029f2256d40307904183f8e92a7f7d32ab5eda31a18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f416abfed0---7756222229.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/77741859240.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/kajuzozal.pdfIn PDF document text
    • https://reniuved.it/file/vikadamurarekafirebija.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xujofute.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/38970494772.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/verasabotijapudidaruxevit.pdfIn PDF document text
    • http://tayles.com/uploaded/xudizuripefanesariravisa.pdfIn PDF document text
    • http://only-svet.ru/upload/files/77960699819.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/pogimebezuxegaziwizaguba.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f23011c9905ec611654e541e49ece944/49231076108.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c2928cf6---gupokanuj.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/15006263144.pdfIn PDF document text
    • https://znalac.com/userfiles/file/walipasefen.pdfIn PDF document text
    • https://grouptm2.com/contents/files/rupixigaguxebefuja.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lazepevigagapef.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7b167a297f54e96b5fc682f2e21b0ced/naxus.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7061488682.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/giragasarijep.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/59820402044.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bab69df7517adc598c0c4a7c8b8fbe0e/48938504225.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tixominiled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+stream+on+your+phonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10672 bytes
SHA-256: d7ff6c4ab7764109fc34435d542d21c122773f18d31505f78a7143f0bd42f291
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 17968 bytes
SHA-256: 9c1e6d05cdc263b62a3c1b0e6445c273a80915e9ba4058231dba70d0bb175c7c
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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