Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fcd13d1f4a2fab…

MALICIOUS

PDF

115.7 KB Created: 2021-08-10 14:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ba5a9ee5650f75d1176ba6182f0b1d3 SHA-1: 69f7ca5beac8257c1dfd4c004903c607b80481ed SHA-256: 52fcd13d1f4a2fab767da14f6c3a7a31e7d5aa154c5110db0a17414686842d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs indicates a primary function of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=organizacion+politica+administrativa+de+america+durante+la+epoca+colonial PDF link annotation
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a551eca08e6---98810247160.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ee15d6331ec---zefanewap.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/27601136858.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/47644159385.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/70498583726.pdfIn PDF document text
    • https://dhesient.com/media/91058489007.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5jmn4pomsrad0lmn4489qg1lu2/88966509452.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jitexezopewil.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b1c0854beba0c9e7c79705884e8bacdd/65596094489.pdfIn PDF document text
    • http://thedreams.cz/files/rixexexaxagujipok.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/nigunikaxed.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/27564159891.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/82702150903.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sofalidigiripitanis.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/23308909508.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l0e0m7jqlpeee02a4o75grp065/pedivegirarulomizo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/kogaganediluwotuz.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210727_020759.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r473rdg84hcdnv883612g7j61k/21898765155.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8bb793bd649412f98ec267d3b6cf0ee2/lipuwonimaxowakunux.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/72756694710.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/1b3483d9a547bc0c8cc4705abe7bb6c3/rabexukabapiri.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/miwumagonoxogog.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gixakamelaragusix.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_off00015d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D41 11108 bytes
SHA-256: adf89443b7f719d55950500a2b714bd72a4ce34c7a4534d20290552aa3897867
font_01_sfnt_off00017711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F23 18264 bytes
SHA-256: 1349738a1b0010a6b0347c94334d92cdc8b23bdbfa31788afd1c3925b0e11fe0

Open this report in the interactive analyzer, or submit your own file for analysis.