Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3cd5974dbfc803…

MALICIOUS

PDF

68.7 KB Created: 2021-09-11 09:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 922b58f37fd17a48f7ac0f2e08e1f86a SHA-1: 6f4a293efde563a8840317e82f7705125d530ba5 SHA-256: ed3cd5974dbfc8033955d3728ff7fb4afef64bdc8ef774cd53f761fc7da38f0a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://vanchuyenduongsat.vn/upload/files/84943606586.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d38a8edf---wobutagugurakima.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/79070452609.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/62962485954.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/47571006882.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fikuxiraxu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/bivijujobefadolorinoras.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mofiletelejalume.pdfIn PDF document text
    • http://prograsifkalip.com/files/toxuferarabidoxuraref.pdfIn PDF document text
    • https://suncables.co/images/file/77779049663.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/062321239562.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/90744267486.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/12350263111.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/54860864726.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210901/file/16305007656231.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631125423.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14333774720.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6qh7bo7r60uo0guscm00u61so2/sirine.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/79712899688.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/50066394837.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/giwaji.pdfIn PDF document text
    • http://checopharma.com/upload/files/61855094738.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0da40f7f---24527199724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ata+mlbb+changer+app+downloadPDF 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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 14204 bytes
SHA-256: 35d93a709d218644037105056a4ce0b683f8f375237240da91e199b50dba921c
font_01_sfnt_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 10908 bytes
SHA-256: c612044d3f0be4ede886888d20f33026446de48b03d9b7e65ec2d2d2324dd05e
font_02_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1