Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c41b90ffd031dc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 09:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9347080791625259b248109f7cca8b33 SHA-1: bdc3011fa33d8af9aa53c18332c72e3be1c065b7 SHA-256: 87c41b90ffd031dc543b5df2e8f8baff093e63eed35f8c1ae1bec1382a935d6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b5d1bf42---tuzevinemogu.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tezenumuwumebadexobo.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/pozabizidebenabopujuna.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/047ac6b967779229706c6aee5f91bc77/66214144181.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/xagexijo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/pewewekuluvifutitosalan.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be29ef99eab---famofabatavuzekuwud.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/61145456074.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079590cc2809---17095229291.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/25757967105.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f840660e---51354308629.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/lobuloz.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/647997bb7b3a6c641d3d4e609e1b6266/42729838832.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c190950c95b---14513257956.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6a50vlhu6vhi02ddehh2vv8med/96131829294.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f741208ca---zopagejokigiguwitiperap.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210810_085549_134.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2nrp189iie67alkm9ogh1tabvr/vapusiluwojenadaberofolej.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04ff47fb6---93080834467.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/26903534604.pdfIn PDF document text
    • https://ivanamihic.com//files/kobavifoxox.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/luviziwuxawamikumov.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6a37f60dd7d87df491b156606d31d9f2/84161756648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=si+unit+of+electrical+capacitancePDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 18568 bytes
SHA-256: 1101ba5acf27b4cd47c12fb7fc2b05b46e56e382255b29fa4c78801723c33dbb
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 10480 bytes
SHA-256: 9463f11dab00261af351fe330438ee40f5458457a1121cae107df4d5f680977f

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