Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5057d34d8be6e5c…

MALICIOUS

PDF

100.0 KB Created: 2021-07-18 02:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecf5ed2c6a75f975e016330baa040694 SHA-1: 5aad7a6ac8e1eee4d6826ddfa7eccca1f3e498ee SHA-256: c5057d34d8be6e5c951a03d6942e8fb4642ffe6db2d0e9a44560fbc796bba3de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geneolock.com/locktactyuma/userfiles/file/xodifurikifigowos.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde34a625---wafefolujos.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c71ee3d22---gagenuxowidimuteleze.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57097b365---zawederewedazonekaned.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c635c3ca90a---risuvabovafodepe.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c97ea9a4---sikofotuxur.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/kutosapenoxuretunovuv.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31fdfe930c---kufewepuk.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429165652149.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/okpf1tnmlte0kslb0hpi2cht27/pobaxefusow.pdf
    • https://sanidom.pl/img/file/vakutulu.pdf
    • http://ampletrekking.com/userfiles/file/sazarufopekipenarezija.pdf
    • https://petrovsky14.ru/docs/files/furatitedokamukevurivek.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5mmavvaisi0llbglqquji8a97/12690359152.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086de342a337---41646518984.pdf
    • http://lasfyy.com/uploadfile/file/20210629123748864.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4288353bf3d53ddc5e50f6d095ad8456/sanonidudalidemunewi.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075626a96c91---lasanupejanigatinel.pdf
    • http://royalwedding.jp/images/blog//file/55132082524.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/vipun.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b691622110f---xalogerisibogudedowex.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-27/20210527234927349619.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e96db969f---42355110129.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=snitch+meaning+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e479.bin
0339bf8a6420558f0f6386bda492f7be3e8e1fb60c77b4d3bcf7493124140410
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE479 18896 bytes
font_01_sfnt_off00010407.bin
20095c1808aa8ceb028d56de254bba5bd4ea84b769d45d9392203407e2054400
pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10532 bytes
font_02_sfnt_off00011bc6.bin
61e9e2d02bbc88d76d67fc9bc32420ecc8fdd7a5ff7b818a43ff30f913d04c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 26208 bytes
font_03_sfnt_off00015aea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEA 16792 bytes
font_04_sfnt_off000172f7.bin
4b86caf71874ce12ab1460a526b0f831b21f6d87a844a0a1273da801ab9b7758
pdf-font-stream PDF embedded font (sfnt) at offset 0x172F7 3984 bytes