Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e559c17e7e754d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f9466fb20c271f66d0e65f86521561e SHA-1: eab4153a66223967da59002d7761371f41d06557 SHA-256: 65e559c17e7e754d8467e5d3008b844308556fd1768740fc06e85145d5617c9c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=change+default+app+for+pdf+android PDF link annotation
    • http://lightofislamonair.org/uploads/files/87843531013.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/waxusosedipuno.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/40576569551.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912124629.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53981ee28---sisifitaxulejo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613479e60b449---49778552992.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nizawaveguw.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/1124254598.pdfIn PDF document text
    • http://www.siposferenc.hu/html/97344430758.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d2d6eb2---rotifinaful.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109011408589679.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7c1325318d7e5d9308f827025c8d2108/vurubopabuvisifajitijetiz.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/44825238452.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gademod.pdfIn PDF document text
    • https://interconformity.ro/images/file/53221626004.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/2994345373.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210912071739.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ctk6llhvionf7e63cms1rrjmek/nozolipisomafulela.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kosaxulilutezasubi.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kotoz.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/36596029058.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/16724550022.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161326ac090a0e---76103138961.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10740 bytes
SHA-256: 03b5250cd9254c90b9db513406d67d2981866f829ff32f6c9d269d08b7861cf3
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 17976 bytes
SHA-256: f57fb874ea025e973756a36f7c2f1d43a56a79c6d34fa46db4ff75c93c257db2

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