Malicious PDF — malware analysis report

Static analysis result for SHA-256 48903a7765f14a2e…

MALICIOUS

PDF

93.8 KB Created: 2021-08-16 09:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b07a922a71dd1ec4f8ca32aadb5cd347 SHA-1: 0a2536c56a4d390974638fd402145e63c9bc4399 SHA-256: 48903a7765f14a2e1c1af23e63eedf89dfbd90425b4939326368b1c883c4a686
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://hysansam.com/fckeditor/userfiles/image/32230897321.pdf In PDF document text
    • http://ebrinteractive.com/userfiles/file/pegolenaxunotulu.pdfIn PDF document text
    • http://ekotronic.eu/files/file/46402941160.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965683c2f52---tasukozutubujafuribe.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/bulomutuxux.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/90857678052.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/62043715975.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgcg282ptudfam0rvf1fpgpu9u/bokirulapokulapu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c8b95255---77670025761.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/junasibalezitizasujosabeb.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/25811443949.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fph5jcsds1s4n1tmnui4o7cps7/sexujagikegevixamuz.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kemokefaxida.pdfIn PDF document text
    • http://paliukenas.lt/i/File/44228455755.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/5235104115.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661377781a---tapadarafidop.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/ziwawamewi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/21c088e26ef4fba5886282920ee042b8/47318503974.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/5277514790.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pekarusap.pdfIn PDF document text
    • http://synfarm.com/upload/files/xivawetesenoxigor.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/44794394541.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97595627290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+hard+is+it+to+pass+the+foreign+service+examPDF link annotation
    • https://lapdonline.org/file/dowon.pdfIn PDF document text
    • 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_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 17024 bytes
SHA-256: 0d62596403d343c53aadd9ea79ba4c15d2b7d7c02bef06f7cd97fcee00b72c3b
font_01_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E65 11264 bytes
SHA-256: b6bcbe4eafff3f35fa9758d0b58eff8fcb6934a5b2bc4fe135bdd1446acc53e9

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