Malicious PDF — malware analysis report

Static analysis result for SHA-256 77173a0f83f481b1…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 90b995678c14f8f34f1a87cab5eda1f2 SHA-1: 70078d1513bd8c26ae441a0f09868451e9b420b1 SHA-256: 77173a0f83f481b19179114c277fbce3160e7a5d04528d16a3df9885c8a1b43f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d9b88f1d8e86929a36d6ff98360f19d7/makipasovuri.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fbe6f1989348f4b200d82ff86bbaba81/jamazalobigowudanugane.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa6beb9db---28863277205.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/wegibo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160876f8a6acb5---25190997625.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/riegbsv94k3ovinmelo8tuhq2f/53975176063.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929d87ebfdc28520cc60610d1bb86da3/86710371127.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tedobajux.pdfIn PDF document text
    • http://ridendo.cz/files/file/95190078748.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/bowiditodem.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jfpt9tkmo220k1q4f2nn074ijc/wujalosezugerukupe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05fcd60d6---98973503846.pdfIn PDF document text
    • http://abpaluso.com/upload/file/58966569207.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/sakagudawirudevujubavov.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1hlfef7ogocaqvvpljd0l2hps2/9673438745.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/69615421198.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1030cc329381352e706bd7d388f2aba8/lojebedutowukiwudosesav.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61ad406819---jivijosuzalenumaw.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6dee89f6---turovisevi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/82429635780.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/979313937.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/wavut.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/81253916778.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3fd5b84f7---kurugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rdr2+sell+jewelry+valentinePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcb393db8---18669077149.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_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 16956 bytes
SHA-256: 2b330536ca15cb3c471055980d9f66f4a0dbb9583562a6f31f446a2beaaec02d
font_01_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 10680 bytes
SHA-256: ad4d93bfe4503411703c2f236666949ecf4fc6d27c0e1639d16aaa0735154d40
font_02_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.