Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457496d398cc339…

MALICIOUS

PDF

93.3 KB Created: 2021-07-22 23:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b7b4a87e73dbe33ca6829fa3e36dc63 SHA-1: 242d29723e1f8679ee6f22b164b2d72ecf74618d SHA-256: 4457496d398cc339bb70f824aec4184b1263bf0bff09024562d651f799642570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9800b9f841---goxidakuvowinal.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kakupetazutiwijot.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0bh03ndrhm0ln3vqgbgmdjp4m4/37561527046.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p3fhf5uugba9ku1ve97v52a9ih/7743713700.pdfIn PDF document text
    • https://altbuket.ru/files/77932298729.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7fd4ppe6u0j8mfkif0mmu0b8f8/49975932841.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/41e65e04a75ffe4b4859b09baae8644a/12886658326.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075de851c603---bagadugagegoniniguvobema.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-12/images/files/malumarejalasixuvesi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/86d78229bc42b8dfd67a68d82f81f6b9/gedozenidota.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda06a33157---jolitemanepure.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/54812289164.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/55493074809.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607687905b683---28554324487.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/tipenuvisepujeb.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c50bc4b2---morusifegufuvelofut.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/45815614095.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vphbm72glm2vqdmnugrrqqlk02/85221377283.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/biviwewedibi.pdfIn PDF document text
    • https://stopserv.ru/files/file/tajapuvopu.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/29006834988.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409518f95d---sebex.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/48349608486.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6lmst390h81hbo0cfav9ob71d4/94800328051.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/devifewiserudizaladoles.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8e3e1dfe---45540817201.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/20576226667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exposition+of+snow+whitePDF 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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 10320 bytes
SHA-256: 048dac5cbefa3e7f779f96fde9b1fec1621a35f7191de4d050d6d828781e79fa
font_01_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 18304 bytes
SHA-256: 867f7dbaf208cec4fdf658797209c5daabf20e44f6c408c00b7e24d5e28037ee
font_02_sfnt_off00014e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1