Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70370225561853b…

MALICIOUS

PDF

82.0 KB Created: 2021-07-08 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7fbdc689ed46110382393f06ed298f8 SHA-1: a0d2b289182a73ef53ed90a2ddc64a26ef13d86b SHA-256: d70370225561853b22c49929d845511f7130719ae9b1e943221b3c36d6aa9915
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This technique is commonly used to obscure the final malicious destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bem5lbplsgfi5lbnfcjgdrf3sr/pakaxefexu.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mlp24jnnhqkvms1mplvatvr0i7/68210939960.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd183129---widemalisufokedozisif.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f1dd13cd9be54a1f3c7aad08843f74eb/xomipilejexa.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/maroworejur.pdfIn PDF document text
    • https://banghenails.com/upload/file/86189377208.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/xajuxakutadix.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/musokizoretusivek.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fb2bba5ac3ec8f508f4a4c07eeaf1af4/fevoritojosoruza.pdfIn PDF document text
    • http://labonscafe.com/userfiles/61272156887.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1446697660beed704502d.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db33eacbf---60630599340.pdfIn PDF document text
    • http://anpo.vn/upload/files/domepabulogewaloxa.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d959f6b2c75---xokenedabijofizof.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076702642fcd---lepixonipak.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3fi6lntc8vsmco96m1u9usedl0/40936872947.pdfIn PDF document text
    • http://juentai.com/userfiles/files/96383022917.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/48433332951.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/04c60c0ab877d6be318f6e0860c939f0/kaboruroridepatakugoro.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3084f55a---23225856563.pdfIn PDF document text
    • http://calisnt.com/uploads/files/12339529936.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/mabejowuwop.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b2dcd34ea4bbfb8005ba27d7531ffe3/5960829654.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092feb5b74be---94570797174.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/xolevafaxodumazewudinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=canon+d650+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 2704 bytes
SHA-256: 604caf145b443f4866dc7aecccb37cc2a901ad555d04c929d474aa0cf79dbd19
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 21348 bytes
SHA-256: 61182ce95bcec6245594efe87caead8a9e4a9bd3fb04e341f3e17152577a19e0
font_02_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10372 bytes
SHA-256: 6d39d6803731d793ca0ae956315f3be792dfeb6c2aaba12fe2ac1307ae604f4f
font_03_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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