Malicious PDF — malware analysis report

Static analysis result for SHA-256 90035d2dd3df7bf1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 07:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 668bf20c82afac0b6931d06ce7a00d15 SHA-1: decb9b415050ccf5551d72874818087e47be7dfa SHA-256: 90035d2dd3df7bf1d475a0ecc00bd4614e3e3666cda91ddf9022fa9262f13717
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=descargar+super+mario+64+para+android+gratis PDF link annotation
    • http://pomodorolennep.de/gfx/userfiles/files/ramepav.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418f480d8ed---62150836988.pdfIn PDF document text
    • http://newo.ru/files/files/xidorinofowolafev.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/61131064800.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/37624615267.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/86317125675.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/9011066727.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gozeno.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/menofuwudavuwigefujemone.pdfIn PDF document text
    • https://najemwroclaw.com/userfiles/file/walikezonimaxuxid.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///favosuwagejogimak.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/83421fb77a2d5f21dbb5920096a23417/ridokujisexogitisadozin.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/68362053159.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/42051457301.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/mofodonibedavowakiduwus.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/todabusipaxerujujupiwu.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/dovonepekufogolefuf.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3f6619ec---35122508015.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/difodi.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/89445319151.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/1206145173.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/28957851902.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/11479546751.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/94194006501.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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 11156 bytes
SHA-256: c0fb60b05327ca6e22dd89c0e111d00f6d680533abbc1b588f171e5bd36bdf3c
font_01_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 15724 bytes
SHA-256: 94794016f272fcacb9a8cb1cf1dcbbd518ec8de39c1cb227eebb0ddd7d0c47e4
font_02_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1