Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f49e38a231dca0…

MALICIOUS

PDF

96.3 KB Created: 2021-09-05 05:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a091e2b71e4b539be2362a2b6809368 SHA-1: a6d23d7843f673da0d50a82b43e9f9ffbc6dfcd6 SHA-256: e8f49e38a231dca05e0b9aea6deb3ed0519d5df77567d524baa125b4693e9740
204 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple high-severity heuristics related to malicious URL links. The presence of a 'download button' lure and links to compromised CMS upload storage and disposable hosting indicate an attempt to trick the user into downloading a malicious payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/anvu6qc8qs2fl4so3th3imrl62/mirujovoburujixijo.pdf In PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/rapobaniruj.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/38566646649.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cuhc8eg5hhqa9hr6trdhhum055/3843131395.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095f34f8844e---67456322912.pdfIn PDF document text
    • http://championsview.net/userimages/batimorolat.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b6a45264---83229412474.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/7136363478.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa71debf2---tatarege.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625143779.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/65268718688.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/94253190310.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/17832926170.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609320d213fa5---73447371971.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/pifipazojedogadove.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/dimugolaguzopizaf.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/45080777141.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/noretizubuminowonu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd3cabee7---37738318365.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/55651262966.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f8ik3m3vlsplkfv16e3tr5ml9d/veniwin.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/44320079980.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/34626138285.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/dovezar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convair+portable+air+conditioner+manualPDF 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_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 10844 bytes
SHA-256: 16a6a6d7c012550aa2464dade8fa15c73f4cf8c983701e34e63cbf185f0e3182
font_01_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 18636 bytes
SHA-256: eec76eaae644f342d835a47bf315cba40678f12c9c23278781f6d081a6bf5a94
font_02_sfnt_off00015b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1