Malicious PDF — malware analysis report

Static analysis result for SHA-256 8182b5f6ebb65960…

MALICIOUS

PDF

89.3 KB Created: 2021-07-22 02:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e397288f7e456870892daed8ed7ceacd SHA-1: 138de899c92299470244c3183dc89ae28acbe7ff SHA-256: 8182b5f6ebb6596053b31d1b62f37baa1b8ffb294ca53e082c41d2c48eb8f5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust and lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/679105bbb591b67a84f81eada42c8e56/rakiwuguw.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/renafexuduvusuba.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/bujobarajapovidum.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/85790428001.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/48483732408.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jgjqvqrjpfphfce3e3coaisgfs/6408375695.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25471847dc---70061088373.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/vuvadekobagujizamevex.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210624042107290.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/81463567953.pdfIn PDF document text
    • https://alutat.com/data/file/32639741497.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zebadefejibumewubo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/56350390797.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jupigakewukuluz.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e298d05e8---wuzederigomixatige.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cdf62e663368dc6ea430a7f7c7610d7/toxerurunurita.pdfIn PDF document text
    • https://chp-travel.ir/data/file/29389353971.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6c29063a---tajowusitavobumu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/81708723537.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a384b7b83---1537281990.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba288c836---18022284047.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18084253556.pdfIn PDF document text
    • http://asvpp.fr/pdf/48295403003.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bqihkk7ibvlm9hqjnim4jnjfi4/66168547401.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kogubineratuzenoladotemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=smoked+chicken+gizzardsPDF 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10900 bytes
SHA-256: 2f323922a3be3aa39a693531d09b3ac07cec4ee2592f2f8067ed576d5acd2166
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16924 bytes
SHA-256: 5386405db5970ed296240f16483cdf20fef3b467f38263074e102af096623132

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