Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0e102ff40751cb…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 06:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f3d947899aa0fe0186fc7b94fd3b1cf SHA-1: 2f54f29ba3813a0410e170352c713714612f9b18 SHA-256: dd0e102ff40751cb56ad1c0c901d195706f7a21bdc35564c4437379d1bfe7249
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • 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://muzeumkonstancina.pl/attachments/file/22261940915.pdf In PDF document text
    • https://irrisyst.eu/files/file/kejulafikomiworatisuvap.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/34524477609.pdfIn PDF document text
    • http://bienbao.org/uploads/files/92088169220.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ceec52f14---94194239386.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/8653214228.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/zesuriwe.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c536dd3c20---tejaxu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/91169a26eefc55007d264402923442b6/sogifatazafadekajo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/71745186880.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d584e6509282d97d165a9f441fcbb6bf/90305285995.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f9eba8f1---74494246481.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080df5a2f1d0---89366562908.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622884435.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/36f4109359df894f21ed34bcc8cafad6/67653763467.pdfIn PDF document text
    • http://vititanon.com/user_img/files/vegipasibofapamekuxelofe.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/59215683094.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/zagituzaninubufukasufu.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/10719683612.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/67350417786.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3da8bf01a---77608413121.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/aed427db9bab4ab4cfdc9323249340a6/98624220815.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab80b1b888bee9432f100515e56e82e0/gixogaradunomunu.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/ridoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=community+health+and+wellnessPDF 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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 17252 bytes
SHA-256: 4e3aa36e39fccd95f41041fd0632c481790f71a384eaa9346e0f7c5c48026223
font_01_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 10744 bytes
SHA-256: 7e4662db7d337fc317f7d6e1f5487de7c001a820d931b1973bf07eda6228a947

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