Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c810d4bd5ead210…

MALICIOUS

PDF

89.6 KB Created: 2021-08-05 03:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76027ad300413182430a1bdfca406d55 SHA-1: 0ed65175c592285c8c16c4af94486d5d43692455 SHA-256: 1c810d4bd5ead21004a29290f44bb3f92698771efd662aa80625a611b96d0c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the structure suggests a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8d80907cab7d891afa3f8c686413f860/surusi.pdf In PDF document text
    • https://fallsplat.se/file/xefubebakijakiba.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/rujuzofomiz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b25c358fa---bogakogenarup.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5d8c1774535476bf869400d36f58ecea/78852928297.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f1beb2c08---najewarizibopoguder.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2ff41e06ea33a04ebaca4e792611bee0/falinafilojozeroribavi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gu1312th0mnntkbkvjusmven46/86700587882.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/587415d3961a7e1bcd5e58ffacc541ef/bixexefaxuwinewanogano.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/getejepuvumulo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bac859b3bc0---32980348641.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/sadakusazafozoboxobalapo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86d479a9e---nusunoziwe.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/65824705696.pdfIn PDF document text
    • http://yuha.be/_files/file/vapixanikenedogetov.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/83407564864.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28caf22dc4---49707449125.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/46488541475.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096170e5d2aa---23957575032.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/3363908463.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e8b8197ebbfa601727b0147dcf5b8549/17179333478.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/60930613564.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/4825268961.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb703721e14---56893238036.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/77a8f43b30b7ffeb03cb89b540ddc351/50638817615.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/35d0bfec1022b0db9404e3e124c9b442/kugeronukutetirir.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092a181de965---nuzemajopuwemubufutoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+natural+skin+care+line+for+mature+skinPDF 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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10740 bytes
SHA-256: 2f104645266ef621d9ebc19cd1e3190d636e92e9356a893cd64839c5a8f341a8
font_01_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 17136 bytes
SHA-256: 66e43d15e3cd7adb6bf74bf8becf43661d081cf2f83884005a9109c570c7deeb
font_02_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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