Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6406a4cac8b4c9…

MALICIOUS

PDF

101.3 KB Created: 2021-06-27 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5b47578244ff7ebb5d86e9ca9bdf6078 SHA-1: 20e8e55869424feae348c544d732584c9118b93e SHA-256: be6406a4cac8b4c969005e2d439c056734f2c2a3a8518276b64ef3a5abca6fdc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms points to a tactic of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac422003411---mewofavimazepobetinibopo.pdf In PDF document text
    • http://reicar.dk/userfiles/file/tuzujisawujanupef.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b55efa44db30ca1f4e74bb0319ddaf63/65436855315.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25db80e19e---kuxadajepi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608481762a266---vujadejepedami.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7c8dfe1a315c15c06a4350667ad98ff4/40458144897.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/pinopumilusibidalun.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/muwiguxuvepowitajov.pdfIn PDF document text
    • http://altinay-law.com/images/file/20260601200.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85aaac8c8b---86131796857.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/lewijatotonagirosolexas.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/b10pc8t62m6gqjpnl5dmmb893d/woxare.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5598901e578dcbd23b72f0393cc4af02/30791901772.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/6aa1f82a401e246767b62efc8a60382c/4361460546.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/58493963580.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b032499da2---85925702701.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6b59ea2efe14015beea44ae92027a04/87761053896.pdfIn PDF document text
    • http://vodnik48.ru/content/file/82760678854.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/33538758998.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609891ea5349c---dasenurazusinifonatufilo.pdfIn PDF document text
    • http://ud2-140.com/files/293320697.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b320acd3953---53632557343.pdfIn PDF document text
    • https://luminex.pl/upload/file/44691000414.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/39713fbad730f08d928fb340a3ea89df/96805232350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tamil+dubbed+hollywood+action+movies+listPDF 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_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 11004 bytes
SHA-256: fd98f4f7f28cff41b361bc7876aafc7a1082ee36a631ac5a4f94df6e49fc79b6
font_01_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 18924 bytes
SHA-256: 6d23239df7d860d9e6e19a1f8e51b9d3051279c8a6d436efae2789d1d162c79a
font_02_sfnt_off00016e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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