Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be57b5231fcfb7d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 12:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11158344925bcf900b39a96fde99f9df SHA-1: 044ca45337db46240e419b3f3fd3a3bbc5b78bd7 SHA-256: 1be57b5231fcfb7da0d448f4c7ebc298367032f21b9556cb03e48bfd18fd1f89
176 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URIs pointing to other PDF files hosted on compromised websites or disposable domains. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://betenrealestate.com/sites/default/files/file/gafakufosuxiv.pdf In PDF document text
    • http://dsfly.com/uploads/files/tawosamebefikuxis.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacc9cfa65---74151756608.pdfPDF link annotation
    • https://pmms-online.com/assets/file/21771895129.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20fe4b928b32e864f47761de6cb8b64f/finegamatufapaterowuga.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/85099656691.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/25461165205.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f85006aaa6e2bf81952f450dd26487f5/84676937745.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109120611411086.pdfIn PDF document text
    • http://bdsductri.com/upload/files/pokasekefuniwidavebu.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/jadixetadijafobomesuz.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109010759091667.pdfIn PDF document text
    • http://erictex.com/ufiles/files/17436017912.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191104223587.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/3950317912.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/51004732314.pdfIn PDF document text
    • https://majubesar.info/contents/files/57864740535.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/91528196094.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/64215529875.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/kuluzofeximaz.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/nexomanex.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/794aa1f2be8d86f34a66355726879dc0/23091158161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+highly+compressed+android+downloadPDF 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_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 11332 bytes
SHA-256: 42727b5aa12b157b2dd8826fdf0c76c6f7ec8b317e00672c12a44779e2a06e4b
font_02_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 17144 bytes
SHA-256: ae5c9f23f655f36722819e9fc14922c1f5cecb199cb2805fe5e24007c9eed78b

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