Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1b9a26cbdadd90…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 09:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27b23ddfde348cf0753952ee314ed2e8 SHA-1: 76b3381e50006f7fefa2cbc54b908d4d268a1739 SHA-256: 8b1b9a26cbdadd90097b911a17e095cbdd7e0ddd5500f824a1cd52b7bf857454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/ff284afd01f44a70ded0bff952cbd792/53639090497.pdf In PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/nosur.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pl8st5ga3e9c4q1p2p3imeisie/nanatipipiloteketijawemo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade7ce4de3---77493330691.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/defalivavebizogabumolowof.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f6bc3eea04714110bd95f2ccd79d5879/97441228468.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nifotadewafo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dbce5b5738c4150f82160bc26a9ed572/54274208378.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fc3fa1981153d4e2da6375da2ba09ae/xidenaxivov.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/47b0fedbe88bc9729a5d1dd52cf3d21c/9515272851.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/62737015127.pdfIn PDF document text
    • https://dhesient.com/media/fivorutomowutegedup.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e8b951e---60546403315.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/hhr0ttk0gk4gr38uvcg5dj7k34/25122146960.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/33915537455.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf29688e3f---kijamisaxomonejazir.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/850349e37ea6957ddf13eb9c99c9ca07/5388375756.pdfIn PDF document text
    • http://terminsk.by/pics/files/rugezukakefapoginoz.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/71853297456.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/16b317579f1b4b55c6761b244a9da5b3/28553237334.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c706f44a8cc---66322938900.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73217bb82b---31982202276.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c1c28e61---tipalusodabuwejoji.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f8a9eb9d92812d226ff9a20da3c7601/nurixufomomir.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b895e79eb3a160346c7c0730a52cb6d4/jonefudalumonapunefara.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/65166877855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=women%27s+names+that+start+with+jPDF 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_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10572 bytes
SHA-256: 5d7aa0aba14379400a5820946cf54fee9391b895cd90b0668e400d5add77a3e5
font_01_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 17552 bytes
SHA-256: 7f052f37d6ae2ff6ce99fa6e85c17d218e5209ef7d9d2b4b2ef852db4d79039c
font_02_sfnt_off00014842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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