Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6b4a8ea32824ad…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e311222d643bfebe359f2d6f4fb4d3b0 SHA-1: 894a7d1a78c4cbf0ab75c4a7d374b9bb6f7f2263 SHA-256: be6b4a8ea32824adf42b26d0e682cdcfa4a208361eabb0618ca008cb8370acae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and the nature of the embedded links align with techniques used to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://royalwedding.jp/images/blog//file/muvapenibarefagoxipotiv.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f211bf348a---50870909609.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f58b3fa62fe6125b1d2e4a372a557ec/21086591519.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/vetedaxisegubuxat.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/166955c17b0b6b776678342b2e246622/kanojunuwinoz.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lugutukeju.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/nilakutusupebuvaf.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/sabadogulagulukob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6261cpfi3cdsbfcur3a77lp5cg/ketitibi.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/20577786205.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/radekili.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6km0linggsmpsmg3duebemcas1/nomaxojow.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a5fcb8968---96695419599.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e911ecb904---lononakupepulukiwa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2a7d5f59d---17166361368.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0efd9679788c0005fc93a5b7e40aab89/bazusuvuxelowimefurapez.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kitelomisigexibegituxazeb.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9980462---buvugofijuwab.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/49656843118.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jufowutilonalabemikokade.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kenebaraza.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/q1u5f1gtfs2n8tlglrcvlr38i5/lumuxuvi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611e78f74ffe4---62459054993.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/29413700301.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/98ac8940db549c3cac3e801be8a70fc3/lisiguturugaxifuzafuleriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+meaning+of+history+kissinger+pdfPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 11068 bytes
SHA-256: cff084280f9415072bbb6c0caae3e96075dd4a39b5681f0482d4f225c286bf38
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 15924 bytes
SHA-256: 30aecaef04ce38c41c7bdd396cec061e1189f96ed646bf3a594d2f3bd6bdf10c
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1