Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e420573c3e1fb72…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 00:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25590c09ee5737735b65764db8367a52 SHA-1: 5aa86fc21a0b2da75c1876d9a19cd0367b41737a SHA-256: 5e420573c3e1fb723a76f071413e58f410243b380d64c7601c34e05ab905655c
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests this is a common tactic for SEO manipulation or distributing further malicious content. The presence of external URIs and links to potentially compromised CMS uploads indicates a pattern of redirecting users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://shellserva.nl/docs/Image/file/sojetivapimof.pdf In PDF document text
    • http://hsiwww.com/image/files/20210623_224305.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m057eoiod5cvk3etoejhd2a7t7/mefuvoxopemifezovabu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b89032b2---67674041029.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/rofebobonerivamota.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/03jgpt526jvjlbdkbeelvrejo5/88966072109.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/julejotazumibizabakazumok.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vuzidajupanisa.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/73931567557.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a102ba9fe36---31458952908.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab419f548---37754568618.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/92371661897.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738ae375b9---wigikaxirovemaxori.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797baf672b7---batunitumibarefolive.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40c7e3da7d---82949719847.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865f073fffa---8608679147.pdfIn PDF document text
    • https://isleo.com/i_photos/file/12862607226.pdfIn PDF document text
    • http://goldmustang.ru/files/files/bomidagabatuvi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/motetubopijujojiba.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/768821b2e0cf04b24aaf6194f07c2973/15497015235.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/masika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=if+i+cosign+will+it+affect+my+creditPDF 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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 16768 bytes
SHA-256: 3e27dc23677400d7627c3c049a80d0500809d79f95c0edd1c6cd5720182e05e0
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 10968 bytes
SHA-256: 31d3141fd54095a4fd9b4c2e07e2ad564435aab68824510e2803e09f5c73509b

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