Malicious PDF — malware analysis report

Static analysis result for SHA-256 731c5047ee8c5db4…

MALICIOUS

PDF

80.5 KB Created: 2021-06-26 01:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 442ee336fe8f5ae43dd0322502a67e90 SHA-1: 3799f55a3fc4560b069263c2ee36f37232952566 SHA-256: 731c5047ee8c5db429e892072d0d30920e9d08b9e29544e70943f232bc9fd45c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://bayernglobal.de/userVZ//file/19324183368.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e0noghj9bu9gqg5tspcgmhfan3/85623093101.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5d445cccfe885cb58e513a262147b7df/43257193055.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/44206114146.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d5c4805dd1f7931fa3ce11c39b4a3c54/disidegowawe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vjef9cj22j238qlshfciekc0f7/fanopulafavuwelidip.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jipomivusenabox.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7b8c78e5---87995996175.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnhrrj9okc4invqi6nqr80l692/77570605167.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/01911835b91923f835d73ca9a8f61bb9/vepiv.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesowijizesozixenekupume.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/34126113237.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfade42383b---kokusutumeda.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cd4bd020be9a5b187f99714cefaf0075/1399760442.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/50256823173.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0f18268cc461f8d5dd2d573e1cc8c409/55573329328.pdfIn PDF document text
    • http://beiks.info/public/file/zonutimafuzugusuvoxiruka.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/452dbe5e6a1112f0e12fc1fb80f137f3/12830428473.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e454c50d3c29bfbfa0a8d4aef108f2f/65939648975.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71eb27559e---fiwapivuzatilajom.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9t1b2o75rq3q3efjdnl2i5m1he/86618892119.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbef5af93---vozizaw.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c37a6f3167c8eddd93df4a3eb8842674/77163891263.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742627050f6---xebeli.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/rivajawajanawawesopotavel.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/lijenevefoxoda.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042909563779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lcm+of+36+and+54PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16284 bytes
SHA-256: 96e8a9e1c476744ecbde92a0957b559e6a69437ca97a38b6149a6a06f39c772a
font_02_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10512 bytes
SHA-256: 72de11bd0f34505c229a8e7d4a30b4768c545f1d98d83ca40323dfd17a8f6243
font_03_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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