Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0c1e03128efdbf…

MALICIOUS

PDF

91.9 KB Created: 2021-08-16 03:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb6389c4056a2376e282424cb806945c SHA-1: f5a079a1187109fe33e3c8c1069337faf204f5cb SHA-256: ad0c1e03128efdbfe89618eeeddd3595e3dd91bf084fb018e1979ab37f4729f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised WordPress uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=resumen+del+libro+como+curar+un+corazon+roto PDF link annotation
    • https://kisikana.hr/userfiles/file/tudiwanadikoxovubelumi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a06361effa3d332f32ac71bb8db10957/xukigorenofuse.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9010f022c---xoxasivefixanegatina.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160845443ec022---wazajijivavizo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numojokewa.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jefewi.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/8259480918.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/gozukepajuneb.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/46253716757.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/521946f957935f1d1f27da9e78978ecd/39031610977.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4en5h33lm8npqa6vdqo3v346jp/gonajavifonip.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbd01f4b---megatonotesulapipavawip.pdfIn PDF document text
    • https://sambelteri.com/contents//files/goniwupurunepezeriz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/75f41mnebc3qvmqtbf7lsdtq21/9527634671.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/094gga9mkdkbdu1runvct3n92v/94468437126.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/5320311991.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e760f65bb01de35e7927e9caabd56c7f/boworetelijukejota.pdfIn PDF document text
    • http://happy-land.hu/editor_up/refidulilexekubuforivoj.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/22287700641.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jl781l3ij39jkrdehh5kvp347t/kevizozuw.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/63057228786.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/9639370577.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_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 18820 bytes
SHA-256: 29ce9ced6af479ce143a2903d8f79d87336defcdf9eec3acb986beb64f5f7d92
font_01_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E4 10876 bytes
SHA-256: 32296b8d335d2784a6d864f9227f742c8bde7baf383bfd130f7473a6262a43e1