Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae5f8d3c4e3ffb2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 06:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 813d5c26c3db8fd25d55860cd6823d5e SHA-1: bf54688046ff8db7f892e883a734aa253e95fa65 SHA-256: eae5f8d3c4e3ffb2ea47f4f6168f9f7621de01942a993fba1994e6969b6250af
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly indicate this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tatnhapkhau.com/ckfinder/userfiles/files/2178761768.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735332b2022---5976036231.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210802054202_8s5y3o.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/binitap.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/12339131615.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c10e42d261f211118fef1cf8954aef82/libikakopidevunevewixev.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4cf5885e38ba8bdefbbffb61870a5a0b/63434466403.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf25992957---rowagutuminaselowosapame.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/ropotofanoxipalixoli.pdfIn PDF document text
    • http://www.bandungmesin.com/file/tumobaxedebifize.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/stj7ev73edu9dhmrp1d8gnu1h5/16851408230.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97b3273c3---lufeva.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/36147132514.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oio8gi8gs7mejhtbg0194fnan2/wanaxifo.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/77800550091.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44f512e03---guzuxitebowilajewexod.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/gomutorovezuvejatawo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c66652355a9---21611201919.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c66ab153---39933042973.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c86d61348f3735d8e26a96f0c119a8e4/gujafu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/j7ut71j2ljifm90c5mh3fjope7/94770036217.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/wotarafaxamezubodo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/wuwalavuburuxexef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bengali+comics+book+pdfPDF 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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 17372 bytes
SHA-256: bd6246274baf8f0384b796a26697b078e99fcb716563ee20b11c07596328148e
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 11052 bytes
SHA-256: 58fcfced0faefd79dbf15c48debbba76e9d369bb33edb453dcae0e91f7b3fe04

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