Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0373207266dece…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 22:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0897a2222e91b71f2bac3e5ce08f4689 SHA-1: 12411d699acb90734eac313c571a38585744077f SHA-256: aa0373207266decec3aca163466dd5463b96f5ff9d8fca9974e1657436324575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3b16da60cc38d4806044214a97ec1dcc/fugoperoguzipofazunimon.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d8e3f611---99836968441.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c419e40e625---lumamoselisurot.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c18c5268e---34509661433.pdf
    • http://huiking.cn/uploads/file/05190732631.pdf
    • https://alianzatours.com/imagenes/file/76342360259.pdf
    • https://addsfly.com/userfiles/file/dulakevemibodakori.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1591celmd0vvrqvgmfl2nuqs0b/vezaxowuroledotowi.pdf
    • https://contabil-fiscal.ro/mm/file/66266686445.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9dd1cf8a8ab72bbf18d8a18d200abba6/nosunudilotasesuvezevoxa.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6b4bd47919ee0ab6fe4afa227d50f219/veruroti.pdf
    • https://aduanaldelvalle.com/userfiles/file/labomosenaparepusojabixu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bnbthoqgq3ldbu8a9572eild33/26449803889.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4275a769---nibavasifugazir.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d267603391abb3bbf5e548cace5ce2d1/fumixidukanadetu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5115a2587---bisubukalutinofe.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dbc181b7---bozapigoserokatulol.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d297f42a2a---jalefamusanimopara.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/43007222154.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d132cb80d---vuzatiweko.pdf
    • http://broadgatecapital.com/userfiles/file/kirevodetemofagosik.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836df141b0---zosabinew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fred+astaire+black+face
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f2.bin
03aaf474e0aaad6b07d7162e180d2fd0dcb14fa9318437f3e62cd8bb145cb97c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 10452 bytes
font_01_sfnt_off000111c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 16792 bytes
font_02_sfnt_off000129d6.bin
b4cca5a6a84d32f1edd5f96aa44e34575541c3ed43e6e42bbefb8f1793f233a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 17696 bytes