Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae8be567a148e1a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7b2fa19b904646e424b687f970b229b SHA-1: 880a2088292bae45e2ec9cb297004134c0b6a940 SHA-256: fae8be567a148e1a476f6fdb69bf39a112a7b8d60f21b595a2a90ec40b5078c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://norilsk.torbay.ru/images/uploads/file/xugasimebinuna.pdf In PDF document text
    • http://myxroad.net/upload/userfiles/file///36807580071.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/72871318936.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lenevidatilinafupoxote.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/ravaxegoruzajudibapul.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/55809132276.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/25638833623.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/nadesot.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/89110332482.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/86585521826.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/50221264980.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/jaxorovizidibugedewetosuz.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/jonuditosotadisameger.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/29434272068.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lamafis.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/terevirarujesijolujixi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/31401667411.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/rufawafa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85646618e---jaxugekatog.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c3ru97g6g8kfm62ujsb1oufk65/22066127062.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4a324917---tepegiluxafe.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/59047151703.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/bewanokofogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cual+es+la+mejor+aplicacion+para+ver+tv+en+androidPDF 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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 18496 bytes
SHA-256: f33f064232b095c36ad79d9e192d45f64c104e7ce1fc2938187fba48bc11cef4
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 11000 bytes
SHA-256: bde8be6143267a1443111ed91cd3f99e935878be74bb643de742f3481f10db41
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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