Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb3f2ed7f41227b…

MALICIOUS

PDF

111.2 KB Created: 2021-09-04 03:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40bcc5b3ccfdf58bd324f09afa5fa1c4 SHA-1: 6b147deccbacdeaaa1c6b1381e79163784b55d53 SHA-256: 9cb3f2ed7f41227bd3ed7690783b1e00512228c2ea62fd84297e55a0b7763f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports the malicious intent of using compromised sites for distribution. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=disaster+awareness+preparedness+and+management+pdf PDF link annotation
    • http://novussiteyonetimi.com/uploads/file/3883457737.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/monajileg.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/13832444682.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fupejiso.pdfIn PDF document text
    • http://www.centralperdana.com/file/mibuvoburavoxinumudogefus.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/vidobosovol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97467c1554.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0b18ddd4dc6650d062a655ca42baf28e/88956430915.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/purul.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/liwiwupopajoganenipeso.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c4b59135---sidekivumufi.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/pogizewojevefusu.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/fbdb4be60c583ff1ab6678a412da1976/ripikeburit.pdfIn PDF document text
    • http://ping-property.com/user_img/files/kovukixewavajaxuvozu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/20b3020d3d62ffadb7d60b9ed418501a/40314656244.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/99609766616.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69c558b02d---94800672426.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4d28d50cac3eddc4645b39ef7d93b22/52231760785.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56c302f33---51967525052.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/warosexaninevivojuvusira.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/89985400685.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fuzumofosozituk.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061204004670554.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_off00014dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC5 18592 bytes
SHA-256: 54e4b477379d10cb920f33aaad0a75be73be87c98a7845927fdded64116de1a5
font_01_sfnt_off00017ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000195f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F2 10764 bytes
SHA-256: 00710be7e07eae01c57bd127274aa0137ad4d5a67b6cb6942ee288c70388fd3b

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