Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1eff26e02b12ae…

MALICIOUS

PDF

84.3 KB Created: 2021-07-14 01:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 683f2310773f7c289dc7481c893e1bbd SHA-1: f7f46433da2804cf2b38d0f45f5e21e819f3c663 SHA-256: 6e1eff26e02b12ae11a7c57cc26b58430f10e9b1c1bcaa213d1796f8bbfe9cbb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of multiple links to potentially malicious PDFs on compromised sites strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3a0f8b400---sejigavabi.pdf In PDF document text
    • https://mariellatriolo.it/public/file/26095557482.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bukafisuremekadolemu.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/kisamonodapepirutov.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/gisav.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/36e37322c267b3d4d5ab3f8b3ed93da0/fekupamomelipesu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adfc772ff---33141116308.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pf7lqom0uug7uch26pnb6os0ki/geremolipiditivepob.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7i71i9uknnh5e9uopksmmrhcbp/bipazalenubenotumivoso.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/zorodomi.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/nisepofatimamovevu.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/seroretunipadov.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/tumokuz.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f9f3e27a924505066830bff866d7d604/fotedoz.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/dixijabebijulit.pdfIn PDF document text
    • http://slsnn.ru/content/file/vozibutaxo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5f4f713481533feba60a43f0871f0305/jonobetiraza.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fab26a601f5154548ca65f707cddc161/kilawenidexajolukorotef.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fbfcb20d---22163003494.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2282d34f3---nixibuwewebarirusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=first+ten+elements+periodic+tablePDF 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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 10792 bytes
SHA-256: 7b2e8a7fda046f2e29c94190ddc98f4ce3dcfe5e0173a4d991960eca81c9aee0
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 17284 bytes
SHA-256: b2cf832ca1ced64976748973383bdffc30395a24333511b3c75abbf3c9c3283e

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