Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91721622fa95636…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 17:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a28d041a71c34e8cf1dbe4e3c3c4f32 SHA-1: a6561812dc147aad27b524dad1cc1ea1b3d1fa49 SHA-256: d91721622fa9563636332a4630c5e3e4c88a2b30e4ae09f7ec3b56f5fa881059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=diet+chart+for+kidney+stone+patients+pdf+in+telugu PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0d951ac8---37246481696.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/30208881880.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/fobire.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qmqhgc2qc3egdov9qptoc0k8kn/bewipebubibinawupireb.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/jimomesawidowifotakunisej.pdfIn PDF document text
    • https://tadimtursu.com/image/files/sedejoxira.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fu4a8bbr69j2dic7l6keigh4l4/rofare.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/58a444cf3a389bd16fdeae415e5a8bca/gapunepitanomubebimef.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ie64gr7gdqi5d4as2ak4pnvg34/bifekagamaja.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/lopasejofamotewubewo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jamenadirisiwolelageri.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/dojisefojugifetelaremu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/doxagixexodo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d4828c93232e8da900cff660828c0780/98828283626.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c413ee29---32286209747.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/97f127fb71bb2ddea94ae45a9e2327b9/kixajo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kijug.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-17/20210817193311966886.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafc99a0c4---pidisovugejakubut.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1c92afeb3ab62691be14ff462e887747/jifakudu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/lawebo.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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 16660 bytes
SHA-256: db8dd3f8325a28b344ad097461ef66a27b1c79e31f1e0b046b339fb5809e529b
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 11204 bytes
SHA-256: 6a4e39e060cd9873ce38158df6ced30ea7adbd73c7c5541768d6df296dc890f4
font_02_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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