Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b57ec28bfa792f…

MALICIOUS

PDF

82.2 KB Created: 2021-08-11 22:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a8b979262049d119cc37aea1e81dffd SHA-1: e94acdeb74e0b4a5f945163ee6c7be1b80a48ff1 SHA-256: 04b57ec28bfa792fc862b482d4f01a56821bd982c92f4ccec90ae4f56ccb179c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=hotel+california+ukulele+tab+pdf PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b8163c76---16134007004.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160814260ebf8a---sazodamowakaxipif.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d9b0fc5d3e666edb3a4829563453f6c1/ruxanugozew.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/jejirodaxorebabekok.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/forodunifikiseponilaluvot.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb8d5b918---zatavap.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ilgcr8o3q8iajrlqqi6h031m48/nididomodavipitogega.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/15341440378.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/352eeac6776b81c1a60a5c36c194cdca/55474340030.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/32652843204.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/rafixuvejutuvevet.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c94073a1331---fexesusedorobojul.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zijupivomezubi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770541a462d---68136997673.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/75993493195.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e06q56c4ldloujfak4524hrn7d/kitetijorofiv.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/14aa2bd6b58fae77954110384bbafe10/pawigiwibojewo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/jrkkd8op2r77ojtgvkvnqqqib1/panogavituveketuke.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kidikig.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/847d0f7e8d3d395aace4f990afd4bcd5/xabikexabelapesil.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b105ed1ef6---96235286063.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 16636 bytes
SHA-256: 33c58bd757dcc1f0c5cd3e6c8c94d7d5fef3d8488debce50d6f54ffd004b3a55
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 2304 bytes
SHA-256: 7f38376ebf8a4f344a8e46fdf520070ac17c469386de79e5c5a149d845921efb
font_03_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 10768 bytes
SHA-256: dcee918900e9679745027d11bcaf848b458c6b69d08ae440aaf1e64ba02c1da2

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