Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e431e578269a62…

MALICIOUS

PDF

103.3 KB Created: 2021-08-09 06:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a56bdaa50f8983b7a6cc6902c1de645 SHA-1: 089cc532daa4c1f9a7da0819d7248e4a736b485f SHA-256: c3e431e578269a6271b699a59562a12e0249e0a2048d3c931261903c6aa3bf95
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://crmrealty360degree.in/userfiles/file/duxokeduropabev.pdf In PDF document text
    • https://basisnomor.com/contents//files/fonimiwefoledoluxo.pdfIn PDF document text
    • https://ccskin.com/geektic/files/38929847762.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078736f252a6---6381957293.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/41629437943.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160983863884eb---84821249900.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bfd671570---furipuwur.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/20432091607.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/60104412741.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/93284165658.pdfIn PDF document text
    • https://linker.tw/files/zoxuk.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0846f160061f4f6d3f83c32e50ee1c37/3440906566.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/75013547971.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ad9eac1f8899b1a70e47aad1a2dd1763/40981494207.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/83068212003.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gilupugaw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d40bb42c4c006014cd5c8062bcd399c/jebulikur.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/sozalagezizufozofow.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ev9paqrvgkmq6jaqu4pdmsd11/dajivomikidamitiridumoxak.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jusejexenawoxuvuz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/10508ad8ab21b0b72bf24641ef57009d/jagaxenuxugunosesane.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/memosotados.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j8ebcqncpq83c0bq3ufo9rigmu/vegiwemifomolusuxidet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=esl+teaching+describing+picturesPDF 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_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 10896 bytes
SHA-256: 84eb67c7e60d96d97e75055f704b85dcc9b9c782fd12eed72e92a99c53ddbb5a
font_01_sfnt_off00014527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14527 18176 bytes
SHA-256: 066f61d6cda71dfad16de3625006d049ce02bbfc2c443aac3339648357e9d629
font_02_sfnt_off000174af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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