Malicious PDF — malware analysis report

Static analysis result for SHA-256 07713fd09f852984…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 09:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93a88393216d2489686b4e158cac1d95 SHA-1: af806db830bbfae68d9e133838cfd8d8531f4e6a SHA-256: 07713fd09f852984d45ecbb76da246b44a0dd016e36c2a600ff39547cac58105
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://negaratoto.com/contents/files/fuwagurabifafimazodu.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359e53d8f56---40431049437.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/leterusugunoteke.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/77002593595.pdfIn PDF document text
    • http://elitvorota.ru/f/file/93221263406.pdfIn PDF document text
    • https://phr4u.com/files/forarosarisegib.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/51683684773.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/wezelibugedubedixox.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/lebubitokuxawawawo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/jonubevazajibivazelenawak.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/3792507165.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zunuvuriboturuwop.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/dalojewi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dbd5e682656470db8c9208ac031557c1/73386263671.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/3243918893.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138085423d38---75812018577.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e0289b248---48608827781.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/zavugukajefife.pdfIn PDF document text
    • https://fivetc.net/uploads/files/63305518757.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/17864384499.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/71122087031.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/vexiraxemuzigole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+jdbc+connectionPDF 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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10236 bytes
SHA-256: 41d01a12450549c2bb9f91699d3e814a102135b777dfde30776f8e4eee36279c
font_02_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16416 bytes
SHA-256: c87b19eb5d9407b8da59b57cb997eb40105244f674a6d46ce48ef201a04ca694