Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fae910a541cf85…

MALICIOUS

PDF

133.9 KB Created: 2021-09-02 17:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: edb045b65191ef8921624a5ba9cf4971 SHA-1: 94655513d1ae479c36e383df3183ec6889c23d92 SHA-256: 20fae910a541cf85724c8408efe3d4b2c25645c3e24907fcd1628342523fef33
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856eeee91d4---89668179346.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95b705f2e---depawobufuvus.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073310727fc4---belapipamaneveserekusino.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m1onf4966058n80fghgtrk2tes/gorowotitego.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/94900161025.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/nixumiber.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5e8707906c023d706371842ec4e60e6/gumejujurum.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e585123564c---17360257292.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217231823492108.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d693f06ef---43336619670.pdfIn PDF document text
    • http://cppzone.ru/users//blogs/file/fujuwuxeparaxabalavuz.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/60502585562.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3dce0d54---ditizexokin.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v4dghhqavq0d02g8pmm4b2t44g/36246795996.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/padenusilegagazojozar.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8fd7b022762d47591c8670562ca4745c/78563844190.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/45449458877.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/43263840839.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e881f37d7da---16496465544.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/pifozikukapivenogiz.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/89504193662.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5992fe34c3dd5892fea1535bd39ba4db/81430839379.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/74282751177.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160debf95ea049---wezesak.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f12f6da2f4---xigusobefetuxowivesaruge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cinderella+original+grimm+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_off00019fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FE9 10604 bytes
SHA-256: 69875b58eb90f751ca1d052f11dd3faca2337d9a7527930623431250318e4762
font_01_sfnt_off0001b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D1 21956 bytes
SHA-256: 5b5ede01b08357f10c73f6161d3a4f4870215f735c10c2db03d969fa31b1c838
font_02_sfnt_off0001f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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