Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4da00f937fbfff…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 06:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b445048918e565dd7b1a275d5c1162e SHA-1: b391c8c5de438a5705542d7b59dd16ed73be947a SHA-256: ba4da00f937fbfff3303f1c9324a85141dde8138b2d26177a3ab25147eb3e98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not contain explicit instructions or scripts, but their nature as link farms strongly implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://csc-020.com/userfiles/file/20210909030310_rph6bo.pdf In PDF document text
    • http://thegioixedap.net/upload/files/fizitokemadaruwotome.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uu0cpcg1u9incl2k992cme1im0/62331113752.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/fodigogub.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/xixaganejewibifixeve.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/59040133039.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jorumababuguxosimegig.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/47427001965.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/galufiduluzutewebis.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/kutipupomonukegibug.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41vqa6n08lq6vltj7kjoego1ie/zupozemisekuz.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/fufafulawe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f98b01536---zasarumog.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/70657dff1dfd2bc72040c39ddc9e45c0/96382958385.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6d15a68caa9feb049f824d24ef7ed75f/juwokivit.pdfIn PDF document text
    • http://master-br.ru/img/file/8750483084.pdfIn PDF document text
    • https://abss.pt/userfiles/file/sinavawefaxig.pdfIn PDF document text
    • http://teifsepahan.com/files/file/tulaj.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/87425522360.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/65147612656.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8c103e912---sabotetuloxufeb.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harmonyos+app+storePDF 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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 15344 bytes
SHA-256: 6d6b60754600f628db6b4242c13bb07cdcde4235c267c140724ef4d6d5e3c935
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10380 bytes
SHA-256: e41919ac3ee7d1a8e251d0afc89cd325297e2bd81e3ffc2331f4a34201af5d46

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