Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb2e91efc7396e0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 18:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2234d41fd11c6839661c570da39b2b00 SHA-1: b30034b6bc8ec96c4eb4a1f6e46dce8526fcc985 SHA-256: adb2e91efc7396e059e1b7aef0735beb8eb69127f85942eb4e1ef42f2bbc9c3b
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates tracking, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=remote+1+android+apk PDF link annotation
    • https://rajatotogroup4.com/contents/files/puvidefazosetuvigifev.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e60b5b981---kemalutufulufa.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/dubudilazexuserulovesep.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/boroxokizexawenili.pdfIn PDF document text
    • http://holzweiss.at/99130155173.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/2334974326.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/lepefusobomozumusi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c43398d9eef5432651649bf741e8c008/fipibiwavazigis.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/90876362906.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/18001878530.pdfIn PDF document text
    • https://gangnampools.com/contents/files/87791903985.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/2167451005.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/72972554421.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/87082185907.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xokulizukubo.pdfIn PDF document text
    • http://dhf-china.com/d/files/24377151143.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/61340761184.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/3652862024.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/bejabet.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/501946a404b80dce481f6be23bec697d/rofafejenelosodazuweped.pdfIn PDF document text
    • https://coluer.ir/documents/file/71059447839.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/52915944725.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/bawigidevalodobirinafolub.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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 17720 bytes
SHA-256: e694b0a2933ba2c4afca437938d71f88b125471605090e3eddbdf119407673fe
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10528 bytes
SHA-256: b7a276f36f70d0da7278c17ef128b3272936ed858de0dcee5db30479d7aed6d0