Malicious PDF — malware analysis report

Static analysis result for SHA-256 9607ff5b55401e04…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 01:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07dd306b5fb288839a0128899f939240 SHA-1: f77c507812322b8d11e80bc8c0d1b3edc429c9ef SHA-256: 9607ff5b55401e04cdc6a29139abb3845c0ae7596187e4f90df01c4f31bd64a5
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to disposable hosting, indicating it functions as a link farm. These links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=estadisticas+del+cambio+climatico+2018+pdf PDF link annotation
    • https://pasarantogel.com/contents//files/45490928813.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ne7cuqaigeo1t9q6eh3au444dd/32334668340.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/batarivu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/migebuduwufavolupubof.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/pibux.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/vukafot.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce2cd6ba70---firomazofenujuxefake.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/jasupiromumidisiwa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/35ac66a26dac5a2778662a9bd75025cd/gejavijumofufekugise.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/67565059642.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902110255_bm9qb2thZ2F6b3ZvZG9sZXRhcGVmdWdh.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/rakilefubisuwepiwegi.pdfIn PDF document text
    • https://777mto.com/contents/files/ruwawimokurudoligudugalis.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vdc109jtiq3c7miq4mvf0lqtkc/64400198765.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/74929939873.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9236752---setonomagugiv.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nnfr3ij5l4968u9v9uijnrslku/lapokibun.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iioffbbqtngv12qg5ttfqo89v2/vevazamukavuvew.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/77816141795.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/rumev.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e0ad4717a291b90fbfa54744a39441bb/tifibekizogitamegixa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/38eluba4e6n3msa3a318ce7ip7/sederigofedofizob.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_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 11204 bytes
SHA-256: 8e87bdb7a6fd9354e1541d5c1d913be8dcd9a32e4cef7dbbc2bfe9768814e751
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 18568 bytes
SHA-256: 604dc6b41def740a05896be8e7533848b1ca063521bb2c0a1049dc8131363e0b
font_02_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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