Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa777e62d9a81c2…

MALICIOUS

PDF

93.9 KB Created: 2021-08-19 08:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83228420b883e05b706f2f14812b7b1b SHA-1: adc080d9b01096a899b086d3837cd7431b71dcda SHA-256: 5aa777e62d9a81c22e37ec5855f70ce1208b9e8599e15b619a184abc813a6884
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or to redirect users to phishing or malware sites. No scripts were extracted, and the document body was unreadable, but the link farm behavior is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://network-italia.it/file/96538353532.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16071848613021---faxinitupuse.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/76uq5h85jmj1ujip2j4ksf2286/97031584995.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/2459702924.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/54361075044.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210703132315_fkchxc.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/30243531328.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bc4bd8edd---66591284456.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ae50940ccb03ac0f49d315d124420368/juluviwulugux.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1dc6e7f4---77435449998.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffbccf8bae4d3bb25ed965cf031e193d/lasutufisiwunikawan.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/01fafe75731f4994badb4464a55426f2/97434437124.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/71267900207.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/nufosepigozutolofipipidej.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/63018892346.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160817b260c0ff---dejorezorowalowaxepurupil.pdfIn PDF document text
    • https://airbays.com/userfiles/file/weloripagozemov.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd53d11b373---xefaxulamedixa.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dufatowizuxapitamepasazi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea35f2fa85---satewuzunises.pdfIn PDF document text
    • http://spharma.ua/files/file/zawasusadejo.pdfIn PDF document text
    • http://metallpress.info/files/dolitogonirokuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+bella+cucina+mini+cupcake+makerPDF 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_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16852 bytes
SHA-256: 6f2c2a335dddf08bbe5376ae723a0c083095d244ea0a702dc7a4bf831e41e26a
font_02_sfnt_off000136f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 10944 bytes
SHA-256: fefc77da2ab0675a21440ce9febb023fb6000a03ee815b8dd26d243cbed98174
font_03_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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