Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ff6668f6394268…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49bd5b6ed35589848197c11ccf5bfa62 SHA-1: a1319e839b00da06ea37246224e4c3bf128375ea SHA-256: 87ff6668f63942683abd981d57db27c06200d13c2c5db813ff6af3bb577a1ebf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely to host phishing content or further malware. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://noithatdangcap.vn/app/webroot/uploads/files/totisuvekasoxegevofixade.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af0edb9cd84---3011603880.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/89509b23474e5c2232a772b7b54c54e6/girekekavajukigozuz.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/13003906601.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/of8iq3u0jeuc36itcbv3gm1305/53008899172.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/87588666037.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe60c66011---kifamosegugupebakopo.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/90862832756.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/93746229797.pdfIn PDF document text
    • http://bamila.vn/luutru/files/kapefarekor.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/86b45e8a301ea997bd26b0328593c5cf/758831709.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/fobizusolenumogixata.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710b61f3f9b---balezezipetu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ccd43c10---nosefixevu.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/rojubobonagumurep.pdfIn PDF document text
    • http://ashioke.com/images/library/File/40620721436.pdfIn PDF document text
    • http://dothi.info/images/files/78558551711.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/forodivimiwetefozugobu.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11682093487.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pegisofatupololibow.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/23f7cc1a220fe0b55fe0868986085e13/69053070524.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/32423205735.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/50781406165.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/88188392274.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6a226969---wutilajeki.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/al6pvnr3n96akqtfadqc464t9c/68720433017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=luther%27s+abendsegen+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_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 18020 bytes
SHA-256: aaedcbf2322eb663c6e572dcec521825a07cfbf9bcb02885d71d8561b5716ea1
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10748 bytes
SHA-256: 2d458009580f1eec42a25380c0cb7dca53966b2019820513fe535b0e84b040a1

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