Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f87ad3c4c8a7c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 15:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b6b3efb8f684fbee73ba4923cb6308b SHA-1: 599d8dbc8c048aed4fb95662aff252cda4ddd464 SHA-256: bf4f87ad3c4c8a7cc9ca68dda76be5e556a8fbad2c2ac66f978c28acf84564d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=west+bend+bread+and+dough+maker+instruction+manual PDF link annotation
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3amls310c23u3ano9bvnnsq8fb/kekinivodel.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/zobedewap.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160983096e2d6d---tiferigajogirediwusa.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kijek.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f6b0b886---gabulopexenafifal.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/78962522128.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/tonubegajotadonopameden.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e98e05280---67734228001.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/tekuxozefosasenebobo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6bcaa26e7---91139438708.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b70224d611---75613777370.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b8f9c9e06ed65999f113b97aa209edc/38784961891.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210804100940.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/26446443497.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/fidibem.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/diradurapibegug.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210803022507.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaef5e84a7---zulusunefukadujalujofuf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/mugajowapuwenobupul.pdfIn PDF document text
    • https://invest.pl/userfiles/file/ganude.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/23074444025.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/72862724557.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/vusurafunari.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/32200234202.pdfIn PDF document text
    • 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 11144 bytes
SHA-256: 697d7759c224f6c0a04519f2a5a9a9f6d88206d471f0c9ffcbaad5086300818a
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 17580 bytes
SHA-256: 887420810e84708dc4ab2766763c837d635fdc3259e32178b52840f98ece0862

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