Malicious PDF — malware analysis report

Static analysis result for SHA-256 6663ab33ff2f8241…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 920f15e7d7d1c50451b6efead36065c7 SHA-1: 8ac8e0dfcbff8f2cb0013a063f2d5c78e8a892ac SHA-256: 6663ab33ff2f8241bca4debab047e8764e12d52c130526ee0296ddb12e948b2c
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. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://esportenerd.com/app/webroot/ckfinder/userfiles/files/29036500450.pdf In PDF document text
    • https://menlopark.com/wysiwygfiles/file/37604928589.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367981d36c1---27530209180.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210621083704.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/73674323452.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8accb9d36258809c9e972df6e17585e0/43252835990.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736eaf37d0b---31647251400.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lisekiruwasex.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/343f2b99eb5c0ed8b725402a9b7dfeba/wuxob.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a061aa61554---30988725963.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fanaxaponageve.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a5d69d4c---guregozivakajepuwu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0899df0a586f21dbdd50daec1672b2e6/wipowuja.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1522f59711---divupujin.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/vomodowekulufotojez.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rovowuvitapegazili.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0ff35e93---rezozarilomatataku.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/74ed80gqi80r79snu6mhmvffnn/82047178085.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/45879785116.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210702165744_609115899.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcd31b3f3d3b3239d3541dd436d96a89/40012692182.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/67185108504.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/53efb1627af0f19ccae8264242ae21be/fojarubupafulejenuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mahabharatam+book+in+telugu+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/81596142600.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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 19576 bytes
SHA-256: 9826b3d9242fb99b3b9efca7ea331a7bfbc876dd1ef430e0fb5b859e80e1a055
font_02_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 11104 bytes
SHA-256: a4eaa9f531d47a05e84399e2acf0d5353932fa7cf7faf58353b27d1066839b72

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