Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e0ebbc73b0849a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 06:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3769b7f459381f30316da9983e5726e8 SHA-1: c680f4d987695b3487d04bd8e6e0b376aca445fe SHA-256: 41e0ebbc73b0849af8e286de3cc16b9231fcd6f1feb9fa94d22ca179540b5931
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and PRC/3D content suggests an attempt to exploit vulnerabilities or execute malicious code. The document also functions as a link farm, directing users to multiple compromised WordPress upload locations, likely to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f6f63bff---27210693734.pdf In PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/sujurujorakusuni.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78364a9c---73469312050.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210904143407374960.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/41523804452.pdfIn PDF document text
    • https://actorconseil.com/files/file/towumojikokunanujugib.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/rulifomavakuravazadejosem.pdfIn PDF document text
    • http://wwsm-us.com/files/file/27598198073.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gabalip.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/92089220050.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/21468459699.pdfIn PDF document text
    • http://ipceurope.be/assets/file/37229345783.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/92207022006.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/37410679872.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/joxikuduluruvadufu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/33069578011.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/xufefimatonudaxudofam.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/47711019071.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/benufopolixetu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/sanofevokod.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140125502ad2---pizuzowegoromozuladexo.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210908155614_a0bl8m.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=desire+2011+full+movie+123moviesPDF 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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 20224 bytes
SHA-256: 2f2864b5f0c530f5554e16b2b8e4f4a58daa4776796781021d290e506d2d29b4
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10644 bytes
SHA-256: eb722e67d134ac233329a4f79884bb4a62e85b7ef6d25c479f48acbb07260939

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