Malicious PDF — malware analysis report

Static analysis result for SHA-256 61334d06e3c7b9e0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 21:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1f9467dbdde908f2639b0f1dd6153dd SHA-1: 42585987624f52c5fc789b951466fd373b51725a SHA-256: 61334d06e3c7b9e0965641f31933c8ecd7a66e7dff8df8944e9a7ba6e70009ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms this attack pattern.

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 http://goldenteriyaki.com/uploads/files/43503599556.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad44303a74a---bugimamimelof.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/rajasijipikapawipusuluzu.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/fibubejetotujexugos.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1d33d05f---lowekojekikexasijodifiku.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/mebiludinawogik.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-27/20210827231339806774.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dac6532b8ee2d4bab6a9967299087122/rodiserufoxisaf.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/tokapolegige.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/7843631953.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/tenipimunotu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e67c90817f9716429cd1da15a0e7537b/11561802752.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087dab8b62c4---sawozuvuse.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210831132324.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/12379038308.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/valolak.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/739ebd2065306c69ea3ae3b8b51978a1/finomolosivoziviv.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bba54760a0d412873ece4270e1dac49c/95422309780.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/89796173101.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/70957594844.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e8e90e5ac---39456200740.pdfIn PDF document text
    • https://medtek.vn/storage/file/dufoxojumigaxup.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505075349712153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clasificacion+de+empresas+segun+su+actividad+economica+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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 11160 bytes
SHA-256: 383933dcf12ec9605611a7169036543682a28938ef260e0e77bdbf84c17a4c92
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 17928 bytes
SHA-256: 0510ae95a2e91a04c0902a1102ff459418eba1ec6032fe5d1837a329f1a96cce
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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