Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a105d0b2cae25…

MALICIOUS

PDF

92.1 KB Created: 2021-07-06 06:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eafa8a2661da00790588474f17411274 SHA-1: 9687812f76d01672c1236049475fa56c1287ea4a SHA-256: 475a105d0b2cae25fb530da80b2f50177c374a2609312a0ee862043b7d95fb2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crewmak.ru/uplcv?utm_term=parametric+modeling+cad PDF link annotation
    • http://www.jindatunnel.com/up_files/file/lofofewavadifekikigosu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bebc26d7---lozirogigazawa.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/jibunu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/gutajobafu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/widinefenixuguf.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7640b64041e5e18ef3112487f745fd0e/84241752776.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1a1df40276d7c531b2c3efae607f8c93/fevujisepelupetudi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9abg3gnfktrnbvnmtqsseqcim2/baletitix.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wufedunekisep.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aabf2a3e5d5c772258407b6b7240a669/xesunekixukalo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/59803082512.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a687c9cf3ec105084b65e9ffd92f557/vozuret.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62d31e0b---99710886150.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/60947022150.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u8cickv1ut0mcb89mmfmsm4gq6/joveriminojawurek.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab546565ea9---52299936746.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/53029713064.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4592aaa8---pubudi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/0974452551d14243e73541df19b012fb/23240050713.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/20100bd22cd0ab6bb7b10ebd045fcd9f/87956288675.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v3epm3o7ji9ltrsko0pfk5tgn7/tafanarupulepab.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/12267572425.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fc43d966bde4b1bbef89b867d2a295ce/96249533780.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf7a1c59929bb3ebbd46be7f19d6a408/67722529522.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc77b5bf2---25514388242.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fd02da1---3357436865.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f3934c15---64136093944.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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 10544 bytes
SHA-256: 686b91831ecb9af32dcad65cd892df45f1b3faadd1011378f7ac494c165cc4f3
font_01_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16940 bytes
SHA-256: 5eb1bfb37a1f82ad14229821d61636a7eed26729fe1f5e380571b49434e602f3

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