Malicious PDF — malware analysis report

Static analysis result for SHA-256 038c8c085facf6e5…

MALICIOUS

PDF

74.1 KB Created: 2021-10-08 16:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72307bcd9fdcbe9403109e73e1c20b5f SHA-1: 816afb8a0e8a37d181a0a2bff85ff89164205b6c SHA-256: 038c8c085facf6e56151d9cec592bd29a676359da110f8f6aa3dfe10edab01b0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various external URLs, some hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://feynburg-uhren.de/uploads/32544177703.pdf In PDF document text
    • http://tareeapartment.com/user_img/files/11144701463.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/vexudagovepapenesoruz.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/36056004275.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/96436310277.pdfIn PDF document text
    • http://saktigroup.in/uploads/45889473664.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/93382302402.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a388f1b0a17b81ac80f6ee7ba41246ed/76133322876.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/kizopepologumox.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/tepijewi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-5/20210905235816426720.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/nidozapoviguxureniriwe.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/75112439361.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/16328139274.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615d5cbc858ce---fagoxomumixo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/rozeteponenevaze.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/mirofap.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/15538914459.pdfIn PDF document text
    • http://grafitym.kz/files/file/kivebemimikoraz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k12jtvia0v673fm38dt0dg8boa/10573277391.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140924b9d894---vaziremefigod.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8342211b---tifezedunet.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/gezefuwabibatewumote.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/bikipijifovigazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+humanistic+therapyPDF 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_off0000c0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B6 16332 bytes
SHA-256: 2d3597d974972df98fa2b0ca0b40359f87e7bb30c8d4bdd77c6c4beafe980355
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10876 bytes
SHA-256: 1d5e9b7bdc562f5d28900f34d9023ae97bbcbbc8cb980d731a7063f9ab7d8c75