Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ffe8e0c060b043…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 15:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 57e4292e840ca7e85f4640c28914c2e4 SHA-1: 7ac183ed9d01d10bd5973dd42a411fd0b7d49a59 SHA-256: 90ffe8e0c060b043e72312919ec3d5096999b41446ade798e6ee8236deabb7e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs a screenshot lure, typical of phishing, to entice users to click on embedded links. The document contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories, suggesting a link farm used for hosting malicious content or redirecting to phishing sites. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=best+android+vr+apps+2020 PDF link annotation
    • http://www.schule.havonix.com/ckfinder/userfiles/files/98889951271.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/50863724203.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/rupazadigibapiwi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/df86a8ef3b9e7fdaf8c766582d5f4815/93426419084.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xuzekavevidaxebided.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/gajonivavuxusimugeniz.pdfIn PDF document text
    • http://spiregene.com/image/files/20210905_093652.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/tetadugavokodob.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/midolakerososazizebibuzi.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/tinerapididadibalaxa.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/bibewironelerakewesaref.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/73b8b7d16ef5c6e65d3156be6786ed90/jutenijupufebox.pdfIn PDF document text
    • http://sciattella.net/images/file/fudopelujot.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62286876455.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/mimanotukuzuvin.pdfIn PDF document text
    • http://kleiberit.ru/files/file/83350971696.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a16c776b2---vazoxalabojod.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/zugipaputirebotun.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/4769039512.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/60861290622.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/jokolemomadegekezotig.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_off0000ae14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 10700 bytes
SHA-256: 4be644120f1f14510a784082eaac460f9a25e0b2d473e2104f8d608cc0cb4ae0
font_01_sfnt_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 14168 bytes
SHA-256: 1b8c2923cda60f86e064aeb941bf495c5b86ddd596557c76b278185397c82e07

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