Malicious PDF — malware analysis report

Static analysis result for SHA-256 8571f059aeebc1d7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 00:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab4c99918b43d3738a86b16ace7b1632 SHA-1: 94de530fb644036993f6f000e9546ecb505a920d SHA-256: 8571f059aeebc1d7ef11d5d6e85ec01b26b58f94213971c57b73e8ed2513f407
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fjzy18.com/image/uload/files/96013747512.pdf In PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/37631412151.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318fc4ab00f---xepegilozusijazeladib.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/27574170617.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/016fd09593a9bf78430a3ea5870874c1/16774210752.pdfIn PDF document text
    • http://actinq.nl/upload/file/nekofokidaxofuneje.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///gimabisutenujojifijuva.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/pigedevesudafasi.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/lofivogixepipileraj.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/37962841399.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/71402073522.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/dadukodokakek.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/71621987676.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kipimevofuxewigiv.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/fetuwavunujitonatun.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf7d5a8664---mexojanetikapave.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/55978597458.pdfIn PDF document text
    • https://dom-titan.rs/files/90417465650.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210924_CF606DBB666BB815.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/kepekuzagumumipotelalanoz.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nipuwu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/16582268689.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/74985266599.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/39956195693.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/93738010583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=class+10+english+grammar+book+pdfPDF 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 16284 bytes
SHA-256: d8ab07cfa3c61287655c694c8ac89e3933326e8934d57e0f6606c0964e311881
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11284 bytes
SHA-256: 55cd7225754f8fcbcccf562eab9aa0b23ab34e1314585d83f06c72765eb281e4

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