Malicious PDF — malware analysis report

Static analysis result for SHA-256 3087ae2c8edb48c6…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 15:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac75c6beda2569ae8542ffeb5b83da60 SHA-1: 0f505c141e882e7544418e88bff61334bf9318d4 SHA-256: 3087ae2c8edb48c6b475dde396fff158c3f322f799c16f257b494b450633b4d1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these compromised links suggests an attempt to leverage trusted domains for malicious purposes, potentially for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=how+to+make+fire+particles+in+minecraft PDF link annotation
    • http://klimagra.pl/images/wysiwyg_img/file/tifuwukofovinepuvupoz.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcd667c1f---48543107035.pdfIn PDF document text
    • http://amdind.com/userfiles/file/japegotobajezagexir.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fumanubovepoxanefeliva.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/67600891570.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f35b2b8001c54832792c72537cd42dbf/62420171933.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/boilfbd8p9vanadvt1ujer6rsj/1515834685.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44ded9968---dupejuvujavomosa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cqi713l7tspa7rnmecps9joibv/59637301307.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/69639050103.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jpf93bf7l09fobc5p3c23tctv4/89680259491.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210614125409.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210707_2DFE5D9F39D7820A.pdfIn PDF document text
    • http://honda-vo.com/upload/file/93702326157.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/80807680754.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/buxewonevirefowajuz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k163i9k10oa8mfsu1eabd6p5e7/6602298475.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0752f37bf---bedewaxemegeder.pdfIn PDF document text
    • https://aedwea.com/upload/foto/50101592538.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/60365321334.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/44496765817.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ca0f2ddc---xavubuzezirebep.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/70b462785f3364c55726425591644a6d/89280449738.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10812 bytes
SHA-256: d344481c6fce18f72569867bb32444641dafcbb45fea03ff76d882aea6e0119c
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 18452 bytes
SHA-256: 7156dbf1656a5dfc1dde5d875eb6c56474c6787490bc4e58a47016cf9ba0d026
font_02_sfnt_off00013d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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