Malicious PDF — malware analysis report

Static analysis result for SHA-256 958b32b738a769a0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 13:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4bb9f890cc926e1ba0ebf995cc8ddfd SHA-1: ddfa97b52e73c8ff65666dfc7e4cb47a3b0fe8a7 SHA-256: 958b32b738a769a03a755ad9da1fbb10e04098021895f4bea02f9e1fdeff8b71
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URIs, with several heuristics flagging them as potentially malicious or part of a link farm. One URI points directly to an IP address, and another is hosted on a compromised WordPress site, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://santeh.md/img/files/275184756.pdf In PDF document text
    • http://blessingsngo.in/userfiles/files/52558538509.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/bukazuzazutubeg.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/97065661613.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/11393204132.pdfPDF link annotation
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/aud7p50vqs85b1h7npp1v7cf81/mijosibotem.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/maxudanexekasenaritev.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0b8a6c32dfa3d2a641a41fc22cbf1ee9/sazurajegalobupipimadoza.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c9bafb8247121a00ba69e5d8d66d8d4e/5120178076.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ea3c7ac7a8397efcbf9f92f4498a9103/11429619785.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/57cba56acfc7269c240de9ea6d80d3fc/63585605443.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160894472dac45---lejitewavenit.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/22187736750.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/8200029020.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b970c9dd88e---91638221460.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7986e899---55090950552.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c60511c---30411411613.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dagokuturulibexa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef08df13ce---titaxokuzul.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tetela.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396c00f5db---81591561246.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5c791ab5---kowotabaramixesixaser.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/39819505986.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/91411351082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+v+coords+mapPDF 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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 17992 bytes
SHA-256: c9a4aafc754eda7146cf5170378f17f5b9f14f71fb3bf25d90a29cfe13c5f6c1
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10404 bytes
SHA-256: 451f7e99dc1a0b1523a2e6a00d8bf3e29a4140a86e145de0b49e2b0913e60f6c
font_02_sfnt_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1