Malicious PDF — malware analysis report

Static analysis result for SHA-256 c474fb9b616a1f6a…

MALICIOUS

PDF

127.1 KB Created: 2021-09-07 06:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a113bd43d057c4eceb70235e8b8da161 SHA-1: b42fa69b371fbf9cb364f703309ec7f03c7b11f2 SHA-256: c474fb9b616a1f6a2f65a135c991419d5fd8c5036fcd9a1ace522e67439072cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms, combined with the PDF's structure, points towards a tactic of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff8f854d31---lazad.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/zinudotevanidof.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/puvewawafidejixoge.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/notozobinajilezutana.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nefofiwasomidovasoneveni.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/33325317027.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/40642162655.pdfIn PDF document text
    • http://espwireless.net/uploads/file/93618641864.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/89480472245.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a892dd1e---bitanaxuzatepagil.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/zozinekiwope.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/povatosaguxetotafofarum.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608240a0b6908---lokajogugajiwufaf.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/nelabegerapubozunixa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/filofuxetilixo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/57493616791.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/wumokikekumeraxovolujateg.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/kibupumitufabifo.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/nazonixu.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/20751235682.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15484341243.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/31512064546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=constructivist+approach+to+teaching+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_off000189b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B1 11048 bytes
SHA-256: 10f84bcac44af1af3a4f344ce7d19d2f68af78e67fc2b61976c264fd80f05c81
font_01_sfnt_off0001a338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A338 19484 bytes
SHA-256: 8fa4bbd0e5c8ad8689865ffd3d86b4b52b3453779f73ba34d977f0897e2bd7bd
font_02_sfnt_off0001d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1