Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42e9ca28b235098…

MALICIOUS

PDF

83.4 KB Created: 2021-08-10 15:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afd6b389bdef95b095022bfd72b87f6d SHA-1: 2ff03d38b99abd9b4fb63536cdfabf6ef9289d56 SHA-256: a42e9ca28b235098efe9e69821bd9797e078223d228192d667f18268d4deaea2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7675a460---niwev.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79c640b037---49379829038.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/448a8b4de6cd4964bb01c7b1acdfa716/10075186154.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kidigaxukemawepebi.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/gadilijuxinezapubaki.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d2ki1p592l0lpq6eaojkl8gqs7/lozerawenawuriwomox.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca8d3520ed---tiver.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a421022a440---saminubuf.pdfIn PDF document text
    • http://sb-78.ru/files/file/vusomaxapirakewig.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/91cv836529dde04h2luutvklb0/nopovewef.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b010a96bc---rigosisenosudoredan.pdfIn PDF document text
    • http://indexone.ru/upload/file/nuvepinivorupoxelider.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jokade.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/modebadoro.pdfIn PDF document text
    • https://isleo.com/i_photos/file/voduzadejivezux.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f0239683c77---faxuvuzuv.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/namerogajabevo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xamiwodadojazofif.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/64078568280.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40543d7b78---morus.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094753c4b90a---vefesovuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tipos+de+brocas+de+perforaci%C3%B3n+mineraPDF 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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10876 bytes
SHA-256: b3c4a646752540595f990025265fb8f809ecdc318cfe53f4422eeba088a15806
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 17536 bytes
SHA-256: f69b988963d05eca16449112ecdf453c730b6da47cbe2efb2f9e183d6479c1b1

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