Malicious PDF — malware analysis report

Static analysis result for SHA-256 6956393f898cc5d5…

MALICIOUS

PDF

98.8 KB Created: 2021-08-29 23:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88c82aa5e36b2486d9c606e77a29a94c SHA-1: 89945fc429cf5c97763b925373f1600b8a35ade5 SHA-256: 6956393f898cc5d51b52a8ccd95f9c50873599b464a2e8eadd473d0cf632323b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate structure for SEO manipulation, likely to host malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=section+123+road+traffic+act PDF link annotation
    • http://studioaba.net/userfiles/files/68661018823.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074320b135bb---gefipetenebetusi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/61c7ea0f926de01baa74175ff0492f97/foxisagigega.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763946488e0---3209651136.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515085505460630.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/dunokatasisawupikuruworu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/37410523817.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/47191791288.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/64125439568.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0c69eec5---selatizipigowagusefuxokux.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/gimufuzonupejepoxisunaj.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/wurovevatavu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965821b4d83---60993476066.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/287064827597ffed7700e3765737e2e3/wowade.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/12175336825.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6db998c07---95075070084.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085beadb1da9---vunat.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/watuvilut.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a85903c2ed337245d75b52e7f0093af9/poritok.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ba70e99f1215a742bfa6addb903fddee/xonuwadogasu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/6579149175.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/m55k29af3crsaod4rfit3br2n5/50524844658.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/26958482913.pdfIn PDF document text
    • http://apsons.eu/files/file/gejilijetarowejoxegozete.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_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001362b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 10676 bytes
SHA-256: a4dab00fef467b8e85185515b37e3afed7971ae43d8cdca1792a4161b83bdbba
font_02_sfnt_off00014ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 17936 bytes
SHA-256: b3426aedc136e83b8c8580dd322535a10855f60183f792de6e3aa60b529688d8

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