Malicious PDF — malware analysis report

Static analysis result for SHA-256 56333358a8b8fb27…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 22:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a59337e1df7a14ef2da0ff89e39dd2a4 SHA-1: 01258148485c55d07f25a9ec1aff1a39dc326f60 SHA-256: 56333358a8b8fb27c6ef17acf4c4f09ca698323f48d90af0b810ea51e8797399
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, some pointing to compromised WordPress upload directories, suggesting it functions as a link farm or downloader. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://pixomot.ru/uplcv?utm_term=pubg+apk+download+compressed+2020 PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c52257551b62815e0a4a72806fcee46c/82750250283.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/siwumabunixenukuxofo.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/kejega.pdfIn PDF document text
    • http://husplaza.hu/editor_up/2440313697.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21eda8f1d---vawimob.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zulukelafadov.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80369847852.pdfIn PDF document text
    • http://santeh.md/img/files/11699624971.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/60149557066.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/97300361772.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908124501921286.pdfIn PDF document text
    • https://coevent.ru/upload/files/37967415907.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c27efbb7---fixizileme.pdfIn PDF document text
    • http://weldingplaza.com/files/file/zulabavij.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/82307389661.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/5274611538.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/40712578852.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/15381881274.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xumadifiwodugekuwi.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/masaxovanutegedij.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/23413903838.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/godalinivarimalape.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/70231987978.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/nuxiresimoravurive.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 18060 bytes
SHA-256: b0ff40605a4caa5a1fcabeb6a175b93f5f7ab642126b9a1d148a6f24585eb846
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 11328 bytes
SHA-256: 79fadeff7f23fb8eaa43eb7e6b00fbd191cd87da974ff01a8296388990edc745