Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d46087d2214955…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 01:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd1f342c4998244fbdf83ec470500d9f SHA-1: a8aa61f0f7f65c2a4d520012799c2e103ef09e1a SHA-256: f1d46087d2214955d67b79fbdc18f948d38a33f55fcad02d494763233bc30704
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm. Several links point to compromised WordPress sites, suggesting an attempt to leverage these for malicious purposes, such as phishing or SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=aimbot+in+arsenal+roblox PDF link annotation
    • https://tkquiz.com/userfiles/file/73558804455.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/26792575991.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/61386043604.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/lisevefo.pdfIn PDF document text
    • http://uteambio.com/upload/files/mubepunusetonatebo.pdfIn PDF document text
    • http://ccshecea.org/upload/files/29373844407.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sutomabomujetolekar.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gepakutatalivujixaja.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/k01p1thul0ieohsiv0gm65jkvj/lesezazesetikegijixonube.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/37379750607.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/82668819565.pdfIn PDF document text
    • http://philipsphotographystudio.com/notolidopadenevobu.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/27478014027.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/mazozi.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/xalitatikemexevuto.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/60635076675.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/lewemagepa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/25019049808.pdfIn PDF document text
    • http://darec.sk/files/files/satozuvima.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025d1afabc---julanosepe.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/93942224937.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rafenoweroxapat.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a961d025f9---39438876504.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/namurawuxuzomilemoledis.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///xexorivupukanen.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306373949080.pdfIn PDF document text
    • 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 18280 bytes
SHA-256: f55d3cddcbe97dd7ad07a95a7f0ae7564f02c620b0b4b1df3af8544e9bc12c00
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 10492 bytes
SHA-256: b19eb036355fe772d6ae42265da5519b636ff65df26d87c0d95c34db0b2b5b83
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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