Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc37f16fbf17c8c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 13:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cb0e058ffd876962053ac2859385d7f SHA-1: ee9acf3836cd8684db29ca2d8252c72904a375d2 SHA-256: 4fc37f16fbf17c8c3b4333c1d4596188b55812b52795775c994c50630145a6f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern involves luring users to click these links, which likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/67c141cbb769664040a410ce64addc4d/83913040564.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607891f9d4eda---52478292957.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/37271754974.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/fokesazu.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/bapetukevezijas.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/44733182686.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a395622ad---dobop.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/piriluvof.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/94387567076.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/norenefamowovuw.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/44654743411.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/21f2c359c3713232fda2592e9076a0c3/86732023595.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/89770534648.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/88166441506.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/28b6d53007eafaf4c94edc839c482961/57268717983.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/523b6f03eba2f2d12202c6293c5b08ad/fakidimububuxixuriwadi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dt49oe2ioj4vdalkf94a2ogk30/vesuterivifevalim.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ed98a2b0---kuvizeda.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/zimokivakazuzusi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4c0be6ba35560dc3daef425ba80cd474/tugokos.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9f416051189002d6d489ed019e4aa591/bobeligidelamizubi.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/vamatizu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d545da32613---74844126547.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/farolik.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/momisejijarovib.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/penuvenujomegixe.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/81349618731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=have+to+and+must+exercise+pdfPDF 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 10992 bytes
SHA-256: e5254583ad992206908cf65b0182b807b5c4e19dc28880fa8153d9fab43e4ef6
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16980 bytes
SHA-256: c0912768c4aeab7ee409952430313c9f70cb210998f39aa1de4b3a9a08a6c74e
font_02_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1