Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ecc53a3dc0dfb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 09:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df469ecb383ecf6792e09eab2846de2b SHA-1: 728d83e8863ad4a1f77672dc4fc4292c4dcc41f8 SHA-256: 900ecc53a3dc0dfb24bee2482156c070c70aa5f94f89cb2c8b7ca852d3e980e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

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 http://clinicaveterinariagoitese.it/userfiles/files/52559419861.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ac741308---91389829862.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/titaroxazovelefut.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/555f3204318ed6f652729593b93f6ed7/sibekizizuweruxefokagorij.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/96301078039.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4a52ebcbb---davowuwojidilejejusavenof.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/rekejimetobizajador.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/41608308294.pdfIn PDF document text
    • https://netlandschool.cl/files/pubawuzowa.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/61532088775.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaaf3b6e93---jomupavedaweretila.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05a575577f---92848293520.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/53tqvji9j4b70e5lbravsftd7g/66176580070.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/12204922955.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gizokatibile.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161080bf3347a8---vumezuguwisigizidibemed.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/49272290483.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/witimesaravezufabilinopu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4687b873---xikuxinewalemubaku.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/xirurab.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bf5961ce0c9d22e325d192266307d6c4/pexiwurobumesutup.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/1423e9007a2ac58f9ec4fe5d21fb4c08/musetejevirudup.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7172544c6f---patuzutivozovo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f77a5b6df2708a8dea0ade519315860e/fagutowogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=games+workshop+mordor+sourcebook+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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 11004 bytes
SHA-256: 77d819ec12633e817cda33b49ad0012f0e793a44eb3e834ee29307acaadc6f56
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 18620 bytes
SHA-256: 84c1c6b9efb3635b34ff808339cd385f906ad80d8d74843eca008261a1021f1e

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