Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cf0c952522f87a…

MALICIOUS

PDF

84.4 KB Created: 2021-08-24 03:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 553b64ee97e9a306df92c7556ef9e7ad SHA-1: 00b480b426e31557f580509d575a752030816b6c SHA-256: e5cf0c952522f87a433eef6519ff2c2b0720a267acc7356d4c0e6d0f07a45f6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of a 'download' button heuristic further supports a deceptive workflow. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thenext.pk/userfiles/files/16523976736.pdf In PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/nitamunurifexewa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/af1e4eed472e8fdf08eadb7641ce9895/97223540015.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kolalazogogavuneginola.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dafujesojuniregox.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/19004110037.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcd633140---ridiw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fd6b5548---zenorop.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/21794852864.pdfIn PDF document text
    • http://ktcz.eu/files/files/paratufigidilunizunekisi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/11884766229.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wiradopidelibimekerado.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ncjv5h32pkkcn5pgm379iunf34/37054265813.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/71866253591.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a500eacbdd.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2f86166f55b03e27b3464de7e434719e/dozokelufuxorigadaj.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/13525429954.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/tefuxugumalavigusobewe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0794f3e5ba9bc0280ee3fa6c255324c9/gezetako.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/sobufegizix.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/dazolijagefulu.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wejimunoboxapoke.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/51802051614.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/63759086282.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7tpd6f445tvmk3v9o2gdrr313/38371086154.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612012d981a8f---zijuvimasudevub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=doodle+army+hacked+versionPDF 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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 17404 bytes
SHA-256: 5dec0aafc11f48f96114ef4603aebab24afeed524a3a4ffe8b64a8c93914561c
font_01_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 10812 bytes
SHA-256: 17b352ecc5e2b13b27720328075e0adb7d25835f5f7d8629268456225e7c4682

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