Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c513582a59aeea…

MALICIOUS

PDF

139.9 KB Created: 2021-09-06 19:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83cf7754c593e55fdce8754ad609998e SHA-1: 1d48d907a2002865762f5a29fbbc64e8a94e8447 SHA-256: 87c513582a59aeeadbfe80fb7d0050bc71040e2d16d8bad40ba934fb41588b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://m2m2design.com/userfiles/92124766025.pdf In PDF document text
    • https://tangentemag.com/img/file/96322568307.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb1678952---batekuxixomonufux.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/berosigiruro.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/47959253372.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/89359419484.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cd5cb91403847529f5b8c833052544c5/13717513685.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad30eebff6---52734568142.pdfIn PDF document text
    • http://abpaluso.com/upload/file/baviremigel.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217281527307873.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072733e36570---94364461931.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/veloputegoborobigiso.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/869d10c48b391ce381f7219f9d20b132/60099511007.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d017549628d---nexitexofizaxilujoginu.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/wujofevap.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vedugakonazijeso.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1901d5c0d---36349140346.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/58738811421.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34034998939.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_70EB6FBFBFE81931.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210702_25b9e.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b8b3cd7---benivavejoxolomudirikar.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af94906ff---fifititerupivevifi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f904721b0e3---lugesufeles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enoch+book+of+giants+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_off0001b9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9EB 10836 bytes
SHA-256: 2c462b41d5c629e1a229f38cfe83e1edb5db904b47a3d683f4e1948500927d82
font_01_sfnt_off0001d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA81 21356 bytes
SHA-256: 638de2c3cae9f3ee20dc0c20edb38d4aa40451a87934fb5fa3c29bb0fe6256b8