Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe7413e7a32885d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 06:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23eb9adb5252b98c74c6343f52aaf58d SHA-1: 34d673fac1ace97f6830da9647684a5705a1d802 SHA-256: bbe7413e7a32885dbeca7f5d96688f2a82f12308efec484d1972601b734b1e35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed to redirect users. Heuristics indicate these links are used for SEO manipulation and potentially phishing or malware distribution. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=secretarial+practice+12th+commerce+project+topics+pdf PDF link annotation
    • http://szwygs.com/upload/69765145018.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bafurigosogofutuvatag.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/pafumezalenud.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/notifopufabitojaj.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nexexomowuwijarupa.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/85275147619.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bae995fcd---mupunobum.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/putigarofimag.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/fonowutazujuvuz.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/56367749578.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed6b6cf2a---95236506333.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titasosikasidadavow.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/tixidabij.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c892c04e857---karipivuxabad.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e7943021---pugokesuzitefenas.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/lamarerizixumunagifebigi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210524130254_gtbj5p.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i6p3dfri3ngbb9opjgv4aa8ibj/luzesodidoxariwatijaneba.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/buwidonotomew.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e1e5743a---21368307287.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/misojelizorefexusexif.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c156627341d---xibipufezosoxitejivil.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c76aa2213b8b0a571ec544363572d063/70537324376.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/puj3jrp5jum8nig75b28jpv29s/kitexijepotijidujamozibij.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/duvituda.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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 17856 bytes
SHA-256: f8ac9c741be64d6965c068cc25de87b8ebe7c254fc3e22ef220297db1faefaa6
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 11160 bytes
SHA-256: 1691677808786793455aaf5537ec27b725c00ff8df0e9ea4a990cc69552fd12b
font_02_sfnt_off00013119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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