Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670e8a536023b81…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 05:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4454ea5b80d29345fc151f5bbe184558 SHA-1: e5442a2846f7e7ad8f80fe3444ef57212c82486e SHA-256: d670e8a536023b81ed1d2acd2b37e74c9d8cfba7692541fe9befdca921a915fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=block+master+minecraft PDF link annotation
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/13056957960.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/63259180806.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a60824f7d22229e3916edbbfc711ff4b/roxabosepipirelaf.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mgjbfsa80k5mno2drp5crrh0rr/pewiv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614092afbee5a---tagukekogipisi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/pilifijiruwukifizino.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/5823774222.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/28464708623.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///pakinukak.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/domulenuxolikowozu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71053709090.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/703ri54se1bnomovt5lpf1ks51/22623642012.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mofepoxusat.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/savevajibatupanagapoki.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zugaxesewojidagukeliv.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/sinaposuv.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/46053905824.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/84892468751.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xofupokipagedizinofe.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xowepoxejatuxaju.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/20360067287.pdfIn PDF document text
    • https://mediaskills.rs/files/47512814250.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/tiririzibop.pdfIn PDF document text
    • 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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 18880 bytes
SHA-256: 80cfeefc56290b708bba60837fe7b0ad6fd046665d947408727597c8e55f11ca
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10644 bytes
SHA-256: fc140322dad39434cf15cd2aea8789006c1e6e41a8d30f07aec990fc3ae9e452

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