Malicious PDF — malware analysis report

Static analysis result for SHA-256 960d5ce8890efd34…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 15:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 121ab63a6d424dd8fb816325d677a6ad SHA-1: 6a1929df12167a0a458a602a18218396804c8738 SHA-256: 960d5ce8890efd343eeb20e94bf3cbf3882a5f203539bd96e8ab76bd4849d8de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dgaspcsm.ro/ckfinder/userfiles/files/60065294099.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/kisudovunituvun.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/97278777622.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/fpu51494g3hpq4de066ka4nqh7/37565839342.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b520c736410---jipumipetik.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ivr5ufe7ut1rcp23oea5msn6a0/tumedawewiwabobo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d37a40a50---53155083860.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zugojuzoporowimuxoxu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772eefe7f7d---9414739317.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/77250528446.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28a837618---bifimugijiliwupuno.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lquhvlouj0kb8akrpu2s1vtcir/pogalavisawugomadilumu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/38981009637.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83044afbe0---24404480274.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c389b2453b5665773d008585acde3413/19261307239.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ac4c27fa989e3cdc083f6e0d1a3423cc/kupekudinixawifab.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a597eb39d5d---duxizixizowo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5ad0ba315c6790c04567ba2d1c99f7db/9975726580.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazutinewaxugupux.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/495939777.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dsp7112tnphtmq5rkh2vgj3k1p/37426286755.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0cfdc0bf---doxofex.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492f8ac0a9---80295012687.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/86815788044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gout+in+spanishPDF 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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10212 bytes
SHA-256: 1e23dbd775f1f3c6e9d95999c4e2ae1255154da2eaa5c02dc9c55327a92ef6af
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 17604 bytes
SHA-256: 451a92705cb2432066b6db15c43dce9aeee42de5810793387de8f5e3e33a091a

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