Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9081fbd5c1859db…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85d27c708b4edee8249d553917a9f02e SHA-1: 5bbced4491aeedc35a9514c5ebe3d53f8b594663 SHA-256: b9081fbd5c1859dbab08ce8aa8b118066dcdbe53da73786cd633a4bbe1eaffa2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=john+wick+3+full+movie+download+in+english+filmyzilla PDF link annotation
    • http://themetamorphoseprogram.com/userfiles/file/75864242679.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bagubekalelugerelo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb59cacd89---21619157067.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/33739602736.pdfIn PDF document text
    • http://hybsch.it/upload/file/nuvusepidagadigepixe.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/butenejugugenojor.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109120232071536.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/93550240441.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vizesetekakila.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/zupoputurozogetuxupaxem.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/vejosunalodobamupixo.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/tisinisewixomaramitusig.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pewipolawoju.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/javapewudemup.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f211b7e80df0e39ad1863fb93ae1c16b/96502700247.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/25189955096.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24820538029.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/35975338396.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/58163949934.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zituwemob.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/69411f8e8274b90b1564932c9f1c2116/21918050414.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1fdf939c7a749fe15a5a88eb8e7ed3c9/wapafaworowaxesejunirar.pdfIn PDF document text
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/81572067808.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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 18396 bytes
SHA-256: bc630c3fdba089800ad4a3b47eb559f203d1d2047a88586f1d2494f198c03953
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 11404 bytes
SHA-256: fb8d890a569d2d77c8b119e982784c6dee3ac3aea7618f5d202aa904301d7883