Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad041efa08237d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8564949cde8e0cffd343c75b93b2e379 SHA-1: 84ee279378ce2681cbbac8e1e27132702175904d SHA-256: 50ad041efa08237d88d10f250a21cb2ef95a48fb99caf4f1ee073d474999fcf4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites and disposable domains. This suggests the document is part of a link farm or SEO poisoning campaign, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=irregular+verbs+english+pdf PDF link annotation
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/lunidugifototasadividotot.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/xowinobanuvumuni.pdfIn PDF document text
    • https://rinducm1.com/contents//files/pufolonibomutefobira.pdfIn PDF document text
    • https://actorconseil.com/files/file/37171800630.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5babe17a2f00037649d34ed1da79c946/68963944506.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/jc07necc20b87imisi293rts5r/88605154585.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/34288242827.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/acka4ibppe49h92di9qrc4n740/35390480360.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kglg3jo3pvot5c8ic5466la491/53422317763.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/4035278297.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/57933544299.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf896737b9---derukejovejebifokide.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/14006343771.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/jubalafubamozuje.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/tasuwilakax.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/65869660470.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/25058082395.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e99a34c2a---vogezejenizasabevudopa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10396d56a---81951326853.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdca3456ff---mopogelumo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246df25d88---96380741535.pdfIn PDF document text
    • http://pasted-radio.de/web/files/lupiweriselokevujuv.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/881e062b07c8fae970f505437f88176f/79746291297.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e51b9f5194a---vemusizalusi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87990558523.pdfIn PDF document text
    • 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 18576 bytes
SHA-256: 2c3d16c73501f1d61a1e93c127f832ff963fccf9967baba4f6533167b8f5d5c5
font_02_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 10816 bytes
SHA-256: 0ebbca76245fe7e8e5b2fa879c8206820b78da4adec18f8b8c449cfa3eb7b494

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