Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0455a7681c3b22…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1458d7db372646117bf450c971e7c36 SHA-1: e99dc3bda5aa3ef022f5d23ec9172967b83e7a47 SHA-256: 7f0455a7681c3b2225210ab99d251e556fbbfeadd7ca3293a9a2b12b705e9b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820b1ebb1---purejugakirip.pdf In PDF document text
    • http://texmet.pl/userimages/file/kawalujeb.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/26dee68440e190101414ceb701749964/wolawiwenizofalopibofotut.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10984789681.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/petemunafopabupo.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/42574750091.pdfIn PDF document text
    • http://linza-market.ru/upload/files/fugige.pdfIn PDF document text
    • http://signauction.net/userfiles/file/20563562271.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xakulirafalenovalulu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/aa3877173f63e3028bb8beebc2ae0edf/gidovakifokir.pdfIn PDF document text
    • https://protrialse.eu/files/files/52062271726.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/zigapijojarizumap.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c484b0bbca---88238536820.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/bulof.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/23403199028.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/90986127825.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74422723927.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4849b62d1.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/babobefabadobub.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pumitigazususojojevawe.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/purewedejedibubu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/79066199082.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/sodazabafazoxoxazatobag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=online+quiz+system+project+report+pdfPDF 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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 17776 bytes
SHA-256: d5b92f1fabf7d1c72e9703cb5b813c6ad805203ee25a9a389010bf9c5af1beb0
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 11192 bytes
SHA-256: 234ec701d4470e664c6a5a9316903030bf6eabad7c36fc9c946a2a82c87f35a6

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