Malicious PDF — malware analysis report

Static analysis result for SHA-256 933b6f04a6c41a6c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1385f353ce8ce534d6284f253615f27e SHA-1: 2974853d3a9bb62cf5d405ef4533d7a80ea1e98b SHA-256: 933b6f04a6c41a6c30d439d831ce251ec241ccfa2c39328e0405cc07665a16a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. Several URLs point to compromised WordPress upload directories, suggesting a tactic to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=holt+traditions+warriner%27s+handbook+third+course+pdf PDF link annotation
    • https://agmatbaa.com/upload/files/88535003307.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/88663765094.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xemexogofosinenide.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/bimuvowuziw.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd54c0c03---63309257182.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd8cc9bfd---boxozivovoxemiwes.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/99705386317.pdfIn PDF document text
    • http://fotossc.pl/_files/file/71727131553.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rixusesagu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf52b4f622---burupowubefivuden.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2d97fe40---48857313315.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f9d6e994c2d40d6a71874b6a7d77280b/lidevuwetenivotuta.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/1468163479.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/47873186953.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/66108717878.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf5a83a9---32273226003.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/xozilupu.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/rogos.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a854563ab57---95001387540.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tuwupojupigofinuwifeju.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078215d09489---79523467435.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608515a68ee53---gusoletuwunusepelaweverek.pdfIn PDF document text
    • http://willbramephotography.com/1757377189.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_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 17664 bytes
SHA-256: 48b78ea70454563eec1a28106a0c197585a896fe80879d6f9b0c752511025465
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 11160 bytes
SHA-256: 9cc312903397fb1dfb515af500a477bf3280592964a4742af548f8cfe1a780db

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