Malicious PDF — malware analysis report

Static analysis result for SHA-256 168a549d6fa3051f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 16:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57a8551f6d2b32bcf8c96f1ea045da8a SHA-1: a4b47bdbad95d67312b1c30d275841bb94793882 SHA-256: 168a549d6fa3051fd73d64d5366363088f94902bf798243ce06de3479ffd284c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=taking+responsibility+nathaniel+branden+pdf PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b63214bf---14393322904.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/dagigij.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/90663308267.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8808e67fc---podinagodalotog.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb79a72d3---92203587914.pdfIn PDF document text
    • http://erex.hu/upload/file/17686472549.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/renobiledovawifib.pdfIn PDF document text
    • http://allycatering.com/userfiles/61701834568.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lalado.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/12566786817.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4sc2sthv4eodqbcqdfljtn3c81/91810313007.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gevajeles.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/suwovagixalotaz.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pikipikofan.pdfIn PDF document text
    • https://menu2uplus.com/images/file/95816296413.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/95416645487.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8b7b9aa01815c281c8ad69943bb68651/xejabove.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/39329870800.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cb814d62a68dd08917c76d73be7e1f4b/budemoka.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdf5158f2---46447778888.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/6915169271.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/raxarekori.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7de45ed4---95072452588.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_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 16652 bytes
SHA-256: d4b46d3a1111a31a72ef165837bd9cc658fdcc3c95b00db80f4a0b230525b5cf
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 11088 bytes
SHA-256: e837f8dfedb739362eef088e9841a79a95b7a0d6cc20b21731ab246c9a19e562

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