Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2abc31bda8fd1fe…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fee51a994612d864123681ec975b0c5a SHA-1: de6e9537c2f2327eb12ce998eb4d3be14ae4f5a0 SHA-256: f2abc31bda8fd1fe303363b553d06e9a50e4265fd132ac4d81ac1fb22b76140e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs hosted on potentially disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2b6cd7c41d5fede39124d815fbecc86e/keleladafokozafe.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6fd92343a818faf03d83d6802e02eb1e/4646028645.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160922cef0ef44---61001286757.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/lafodefuwekiguv.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/34379239227.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/93tr5rd66ab8e5l5s3fno427kg/43835887471.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/bupelapigiviba.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20217314928.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/57585519011.pdfIn PDF document text
    • http://technocom.pl/editor/file/lovevalone.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd1e41483---juvobanelepatu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/dutepakogivexup.pdfIn PDF document text
    • http://sun-tes.ru/files/file/senanubimogoro.pdfIn PDF document text
    • https://iword.de/userfiles/file/51507110568.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/63381511760.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/tibomafaz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e56442cbf---puwofipexamefobeti.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/ragibewatoroxaga.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ml43m0v6mr8bff9cskjdsrfscs/dulovawanugav.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9a853002ff9c561bb5babe3785bad6e3/60757070531.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mumuwiboporuroxejerilos.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/2ka0fd7m6bbbrq4un9ui7rim6j/19682464565.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160df98289727b---xupemiwulevek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=javascript+cast+to+doublePDF 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_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 10700 bytes
SHA-256: ca049d6c175130fd1b0467115bc470b8bc8e8070ed6889302e17e8a554b72659
font_01_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 17216 bytes
SHA-256: 5ed63dd2f3964bbc7251182dac33b28b0a9e9b7733b05638bd8057b97bdd8602

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