Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d8f621921012cb…

MALICIOUS

PDF

89.3 KB Created: 2021-08-10 04:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dae8faed0b0fbeb5c80cc7d7f48572b SHA-1: b9984a9878719574105b50bdcad7653d0ae15bdd SHA-256: 27d8f621921012cbe52427bd144720fdd2885cb401d3cf3f20f8bbc1f66e4c22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an intent to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704005065d5---jitigim.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/vobajoxijewujazivo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720177ee802---wizejaxomotesika.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04e8000ee---filowunuferusimetuwetigaf.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210801045119_46275k.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roxebexuzaxunenudotedoge.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lobigabidagejagulepuju.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c2d41m27vhld188294qll1m0ne/42004307960.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e42b4489e6d482ef4cdb6d0a00b22ec9/tuvetadavamona.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/86712017919.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/febekonisovaw.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bb26442666f561f129c7b4da96448b36/57660590252.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad2d90ad9---fataxomuzuwananirololul.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a332232541a---6996832491.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/92891412876.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/turudad.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f492b711c5---33939534115.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930cbe52ba5---86221384675.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/15863418522.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107a2e13a856---tomur.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e48ae40d0c0a3588d9b1ef773f685786/35818407668.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/44135504898.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/lubexaralosow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=caracteristicas+de+las+plantas+c3+c4+y+cam+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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 11056 bytes
SHA-256: 752fd631b7ff90b502a9233743622a3284834d5f41234c32eb3c8a31eb043bd8
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 17440 bytes
SHA-256: c484edec1d3b30c5547ba84d522f75d8e82ab5a8031995a8c545c41b6f36c034
font_02_sfnt_off00013c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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