Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd492931e0b4684a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 16:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba2fafefa04253ce93aebdf12c63e5ba SHA-1: 5c92c283ac4f5dc3d510272e71e671836df361a4 SHA-256: cd492931e0b4684a2e9ba61923a99089d6493648a8278d946abb4bedcf71c018
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple domains, including one hosted on a compromised WordPress upload directory. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose beyond acting as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 http://gyogytornasz.hu/editor_up/88594297161.pdf In PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gixexoneb.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/ludipibowaginiwozijo.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/30576528494.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/momidid.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/umigm21buelmduvd3c9gcj3nmi/83899745712.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/roxiponazegigewevite.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/43472790256.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1c5583f40fe3958999a6c8e613c4ef08/poguzefetobepuje.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-22/20210922165033367229.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • https://cape-electronics.com/media/file/86823238185.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/lilalexikufaruwugudekog.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/daxebujo.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/kefivibapamanavizes.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/gedevomoxufug.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vabilafodufuzowesofapanav.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dcfe4ee2b---39683661937.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9913e08b---lamadixejafovopitasikeze.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/ribajikazuxazarenuvus.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/tesumikebe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6jj13o37s8hk7fo9168kpk1ifr/90285583640.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/40179129665.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/90384356086.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/17208911193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=snake+rivals+apkPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10260 bytes
SHA-256: b653dae3ad4597480bf7ebfbba043458aff89f0652ce143dd6df7581424f8103
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 18192 bytes
SHA-256: 4fd224283543e81975bef47d55b2bca7747ffa9c71a2f8c4a9d31497cdfd401e

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