Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6d25e374fdde4…

MALICIOUS

PDF

96.4 KB Created: 2021-08-15 14:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ce0b13415c7f419234b461f05558a6c SHA-1: b595811198c08ba58de90e0bb8937a4951d3307b SHA-256: a2b6d25e374fdde4286fc60d4174b4cbdfe0f564f3e42482f94f94e11d1760bf
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://amblamy.ee/upload/file/49296305427.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/daab8cb362a074eda143f80d9220cb5d/pamokiwonujevejegiwif.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/35830082829.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa2aca968---34080909860.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ge4v8e42mfi3phmre76shkvp6m/97289371301.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/39292248386.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lh1djr3tltnsr5pvp0hm3cvke3/fozamojej.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/niwipu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56608984607.pdfIn PDF document text
    • http://chongros.com/userData/board/file/luwufejiludokokibe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6c139ec4bfa0e0d41447f020dfd83c48/53290959035.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab806b8b68---79582906509.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e950589664---36257520241.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76538fb2bb3cdd678802c2c13a2b670e/86930201367.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/3238556774.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/pivozegivusevorozowe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/66899067279.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/61039334752.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f9750543c5c81b6334cfda7b3addcf50/vejurebalanalofelil.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/pemesadipifuligazawanadi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7f60120059494c4e982f2482e25a589/jowufipanifepojus.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/14b6f32d82e328c8b5e4f8f50cd2558d/paposepopeduli.pdfIn PDF document text
    • http://raczcsalad.hu/files/vudopefivazerotudapafami.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/forafodemujizedazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=m%C3%A9todo+de+jazz+de+piano+pdf+gratisPDF 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_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 18032 bytes
SHA-256: 3363e187fd32577acf33241747ed4b846f78da5afd8f3c0a38038b9762bb54ba
font_01_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 10964 bytes
SHA-256: 2ee35af1f5f44a03aee69e112df8aa9358982845c9ac3b8c0c953b04e72fdf33

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