Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f0275cf9032a75…

MALICIOUS

PDF

179.9 KB Created: 2021-09-04 07:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23ddc881846f4c39d47b3f0ac16cd829 SHA-1: 5c39fcac7cb4a30bb0e10769562dadc0609648d3 SHA-256: 77f0275cf9032a7594f582f301c60a92bac9881ed5f5a73428aa48adec0a264b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/38707734624.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ooh5icj10pja7qdrk6uvcpk1jc/gisiradogojugagigeruvaleg.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/gugafotimisumubepi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/43920198298.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/brp5tckjplbej5pp3umkpbl8l5/xofamefokel.pdfIn PDF document text
    • http://dalaichau.com/files/89232169545.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/66138dac006ae76bb5f18e4ee2342ca4/99947972506.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d83940d099---tidexivejiruvavaluxo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e7c6016---zuzivemafidulobamuriwiki.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/vajibikinodorotelazirekur.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tutiribujijo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a175b267b---26506595151.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/13774794879.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7dlfgoi1enq31d89dhvhofseht/41449494103.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/40806273267.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/tikedomokud.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/567ebcfb3304c010d6e19b27be584362/lerutaliraxe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/alao7cbk2hc74pbjd8j8aiqqb0/xikafufivulupi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/e8s8771m29n5348iil0nsmplhl/wofamujuvusadik.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpeidsuq0dcnldiobcnbr0rckm/lowavaw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9a4gq2ij6fu8edll59m1mrlr50/45613783790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=modern+maid+oven+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D49 10304 bytes
SHA-256: 738d7f53c8fbdb30d61050fa45d9062ebb5fe0b0d8f3c0fb57112a12e189266f
font_01_sfnt_off00027462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27462 19932 bytes
SHA-256: dc3daf76ef7becd4997d6940541026c1306e5f3c93ca12e6dfa554b76a0c72bd
font_02_sfnt_off0002a91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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