Malicious PDF — malware analysis report

Static analysis result for SHA-256 1821f625cf7c17be…

MALICIOUS

PDF

101.6 KB Created: 2021-06-30 06:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f58466d8c8789e561d0795757719a74 SHA-1: 084b85754842775eae88ea646e4553b650833d62 SHA-256: 1821f625cf7c17bee6254f9c01b58a6a7f6c71534b6087d15daebf5ea12e600e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs strongly imply an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://piau-po21inn.com/CKEdit/upload/files/gotelilanudojazinos.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb47d3313---jujubusefuromosasa.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/2433039534.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa80150ba---58361775316.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/52517732399.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/27c4f76e0147c8240a84dc0589cb447a/25179538234.pdfIn PDF document text
    • http://splogservice.ru/content/file/93137499574.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hfioeu6d0rre5qa4n3sdv6fe10/21937544588.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/24106763159.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b202ea277a2---10078003225.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b903de2d---16369464522.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c11daa82de8---noreribirewolu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/40687831490.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6j7ne12kimuksn4en5h72dv672/75053536520.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/487930774e03ee732782331857a4620e/tugeza.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a773a58147---98526281052.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/samexipeseg.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/deterisosapep.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609273ff24a5b---puxituwuludab.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/625459828.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ce00c280---53565440866.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/62069971368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sinus+pain+and+ear+painPDF 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_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 10296 bytes
SHA-256: c915897e3e2de827a4a16e7237add479868710866d0e79cfd18cf9b9542b7350
font_02_sfnt_off00015b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B82 17692 bytes
SHA-256: 126f2458dfa99933b2a26c43a7d99cf14a6eb8e01db867a6060a4585b58b55a6

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