Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f2751be72cca47…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c2a9a1d6cf281706800d7464319c7e0 SHA-1: f939c14ec89caf8bd1894000e21f95b7bfaa5743 SHA-256: 52f2751be72cca47fc4b79950e0a89223e5a8f82421229b9922f745b2cb4df82
196 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which are hosted on compromised WordPress installations or disposable hosting. The primary malicious link directs to 'http://developmentassociationofnagaland.org/nbloom/fckuploads/file/lezaduwixibefa.pdf', suggesting a phishing or malware distribution attempt.

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082805b99062---jarogerotubivov.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee661a63a---58903171637.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/vimaxidamulunijefuvi.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vojirelijo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/dapipefajow.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/fetadasax.pdfIn PDF document text
    • https://rosycaffe.com/file/66384339181.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/lezaduwixibefa.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/notuvigameb.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967630699f7---renekeji.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501101155407205057.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70e4d4bb9---xivotifegafafa.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/76739015692.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/82450460210.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/19447287088.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/13984185948.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/filapavezibinud.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wolitunarepofegutavejuju.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/kuvigegejigizuj.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8712c72b24---22297227260.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072e313022a9---10787616547.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/51350704172.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bezuvirisol.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae863f81d---rebujupoxegupabobik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=silent+night+jazz+chords+piano+pdfPDF 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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 11164 bytes
SHA-256: 8a26b724795c44f9db5d07af025409096a35f6a48a09beaed2a1af9d2631f0ec
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 19696 bytes
SHA-256: 468efc11448f2ae8bad3588ccd88c4ee6de0a0da9b21e30d117c15cec1521050

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