Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4d19e6a8950840…

MALICIOUS

PDF

97.7 KB Created: 2021-07-21 19:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2632266d6146717f026f9a7a41cc1263 SHA-1: 45e319d4d040e40a7f65733015dcc8755db30854 SHA-256: be4d19e6a89508404739cfe8eb24ff7298016bce50f88b8e4cd4c08ed0490b14
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://pwr-tech.ru/userfiles/file/83913609965.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/7388302705.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/tumirabekivujegififav.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/2c0c7d2218f0e8fd1a1f4bc8666579ca/juwimomewepujitakafo.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/gaxalidadumidotawujiwixad.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb50e9d9e8---46687720885.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/70380228467.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/365e73f7d981d73d27d34d4ff9e483f9/mitejipogugurarizal.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d072d2f0f---denazugaxegebilazazizosa.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/75692386098.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092186b52e39---25696930963.pdfIn PDF document text
    • http://swiss-ex.com/buginega.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/wikudajinebonixudepu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/17571391030.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1b21a01d284eceef1df3e02477d90443/raged.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/96e345553dbe8c1fb9830e6fb309569d/noxobezuguzagepikuge.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/19371024964.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab271b8305---xiniririnekipozidadowinep.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/lenogabo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/69159884884.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/xiwop.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/589fc8af45bfeb68ac7bb4d7c7ee03a0/vidide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=comprehend+in+a+sentencePDF 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_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 17464 bytes
SHA-256: 1d1aac27b74ca0cae33006a51f93b60acb8a0de0c7d14c27f9d0ddde27e86564
font_01_sfnt_off000147b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B9 10764 bytes
SHA-256: ffd40056d110ee80c5ecf46b0f509e21663e018024fb77eb16971ac8883fbc44
font_02_sfnt_off00016054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1