Malicious PDF — malware analysis report

Static analysis result for SHA-256 870aedc408845ece…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 11:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f1ca665b2e72c7b36ad7df97c9ca12a SHA-1: 2b2e6cd3130969614498bafae7d5744c14493347 SHA-256: 870aedc408845ece8e7de1f883f87110597c1d3abcee20b681b2db2fd76a84b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://morpheus-architects.com/file_media/file_image/file/71400132016.pdf In PDF document text
    • http://cppzone.ru/users/blogs/file/7815231127.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/72692356004.pdfIn PDF document text
    • http://gaudi.tw/upload/files/15627908715.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c933ca9ee1---babolozanojizolipimax.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefe367e8a---25331709490.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161442aa90805d---gadej.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r00m2m3bqr9h03fg284t7vhtsk/luzizulalikavokurusaja.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb82899a4---dojovanowonijud.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0f73b7375ec826e0bd10a9c7d233fb1a/88606667669.pdfIn PDF document text
    • http://rnralpha.cz/res/file/73760740054.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139685f8606d---zaxemanasuximalixena.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/3839425314.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/soseno.pdfIn PDF document text
    • https://2acontractor.it/images/file/69960070038.pdfIn PDF document text
    • http://vkts.se/userfiles/file/xasisevuji.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e3e0072c1f9ac81b782e3ea3ffa36148/42983853613.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/57e47f9df3f2957cf224aed93b678647/menikawotoleritowinozib.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/jowetilulewamigu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/falesalanivexizaxiku.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jekowizirof.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/51754358091.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/potexixoxubun.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a0aedac79---jifeloxix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f029826d51---gegiforetavison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=changing+our+understanding+of+health+reading+answersPDF 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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 15484 bytes
SHA-256: d758a9d5a2ea4f4c14108f7c601bbac6acce4d9694b591339bd91adbbe5bd036
font_01_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10852 bytes
SHA-256: 70265df98f37d548b8a6aba0848326a26482615aff84c8cc45e64e098f1518db