Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbc404d45a75f11…

MALICIOUS

PDF

115.0 KB Created: 2021-08-20 17:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 63036d6c9fae8480a8326ff2bbd573c1 SHA-1: acb01999f6430ab3d7812ea5d93ad98729c0cdfb SHA-256: 5bbc404d45a75f11ee5adbc8e35b6be8693acc2491e60c26cd176e9620644014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/9q1nrr8e5j454socpsr5vd6a27/24973880126.pdf In PDF document text
    • http://studioassociatoemc.com/userfiles/files/23429087989.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/13061780627.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2ac3502ee4b1fca992b2dc74efd2d152/pemipa.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/dasufano.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/77908095186.pdfIn PDF document text
    • http://nessium.net/userfiles/file/8100017228.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/130fcfaf0e0362a83fe00b1edf168c29/89791419786.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/69900249811.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/88679461396.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rexenibivawonabutotazod.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d5277a70---74914636955.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5j5pp489dt308amu2kte38jjkb/tatusamefulinil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084389e81a08---72964944647.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wituzuwabetolif.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/67179191896.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/37150104602.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7k5o8gckve0f331dgbhjt81hfn/30134919366.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/80535276707.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/19771493421.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb18de2d41---tewirojilatazeganigoki.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/farerowu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/kupiniburonadiroxotugade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+z+mugen+edition+2010+free+download+for+pcPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00018e4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18E4E 24724 bytes
SHA-256: 7f213c28e904aa98096b1173288bd090d32feb5ea71e34d6bcccf90148654955
font_00_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 2328 bytes
SHA-256: 97ec669d954d95f7f11ed1d7b8736228109f07c966ab3d6524b1aa4964609446
font_01_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 11476 bytes
SHA-256: 16f5b800bd137397930e910d3aded47721673828bd89a5e87883bf2f50a737b4
font_02_sfnt_off0001408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 21100 bytes
SHA-256: 7ce6e69ddc1ab5a530b3674093c0d30627c024aca110e52c1933cd4d19d7cc7a
font_03_sfnt_off0001763d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1