Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1b98efda9b3672…

MALICIOUS

PDF

88.1 KB Created: 2021-08-24 22:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 509e9aba4164042c4bf8425d482dcbf6 SHA-1: f332b3edb759808b918539a6882dfc12c7ad4c29 SHA-256: be1b98efda9b3672a8a50c10faf810e1f7cd43e2bd0089d11c203c5788c6e198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/93bems2acsrtm9d0r66a98i8b9/nevebakovopolokek.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/geganugunufo.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/tugetemepugidava.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3240d79576---rotip.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/938ccb34396dce1719869eba8a8c636a/16323044422.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0km3f0r796hsa8t0msaq2gegbb/sopigupidogaletobajakuki.pdfIn PDF document text
    • http://apgindia.in/uploads/file///newefuwaduwobukimavo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iao2nke1ccjitqq5rcfjlulldg/70840459596.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fk9sklu75dfmee0m1da927hr12/76066418982.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/7864254032.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210601_FCF4A69EE200B7FA.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/jizunaliwajufuze.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7880209af5---gopavidunasuwobebaxezeba.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0aed90a2---jizarufodifi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052352f21a---64247368449.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nijuvonupe.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11c862d4a---ruruxomaviwuwaxoki.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ed5b40017---97005671627.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/39325577222.pdfIn PDF document text
    • https://beaszemin.com/files/nufizi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0b812c5bd25cfe7ef5d695d9c39bfb36/8853402642.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8c5e33e534a05ec0f6b60806e610debc/67160406822.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/lezusifupebubabuni.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/rojalaxorujura.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2j8fm4e83hlfe76tcgap7pc0bh/5172756850.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d947b722f---gifuvofilit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oc+curve+for+double+sampling+planPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 11196 bytes
SHA-256: 4716ebfa5db4e60f922ae50e395de182d11215d196dcfe6248ad80a0d473a417
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16892 bytes
SHA-256: 42fca761c3a87fd9ed78db9ec07f937c6ab9d72ceaf48b2e06f44331e1eec682
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1