Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1866cab6ae0f129…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 22:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27b6f97d25c2d74fc72c2348920a1e11 SHA-1: 6eb31fde249cbe8d4946908d9066bf024847f1d1 SHA-256: d1866cab6ae0f129274c9f4d0c751eb1ed35467e184527610019bc5393d6703a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of embedded JavaScript and the redirection to potentially malicious URLs strongly suggests an intent to phish users or deliver a secondary payload.

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://drafthe.ru/uplcv?utm_term=mario+64+creepypasta+rom+hack PDF link annotation
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/99438217658.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gghle3891pcb5is1iiqovmg722/kumona.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21420140493.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/dovejeperi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d49408ae---33928437811.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/80131fe74a2598d4d18db03a8f28e19d/gotokemixotimekazovun.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/zexotinejufosukun.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/18951916695.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/39519842091.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/losanudafilu.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/84182078536.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/22501459977.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0001984b41ce1e378146b154cb288d00/3423410206.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/wavesodulutod.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/menubovafupixelarupejex.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bixuzaf.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/novirojanazu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/89077788139.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/24983622457.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090216565869.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/92059671344.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/diboborunuxefolapamo.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/80407504469.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/7736457417.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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17860 bytes
SHA-256: 8f1dcfed516399540502825cf147ff694635355949b00991452d978d19242c70
font_01_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 10936 bytes
SHA-256: accb274932e7a01c9ef2c3b68ef033377d2a6e70bf689c8c3e6fc6d5d359fd3b
font_02_sfnt_off00012fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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