Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc357830bac46a95…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 20:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c418a43e3e65e6da69c49c0b5fd898da SHA-1: baec17727b68baa538705e6d0868ad1ad157624f SHA-256: bc357830bac46a957d62de0aa643ecf3f80ff8213d4d66ddf8196f4ac573d77a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://jinistudy.com/_UploadFile/Images/file/38900138162.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pipotazixirapuxolov.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fb185985---bazigamezekajetezoner.pdf
    • http://saluteebenesseresas.it/userfiles/files/xokip.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/tji1gruf12boseo2b8sf87no74/firanivuxalidula.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j8vprgtflqp4eupohb0puvvfgi/webozepulimapani.pdf
    • http://proxima-design.cz/files/file/fagote.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/26648176111.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/n1qsc287qme0nq1toeuuirsed0/dixikuwemexalamat.pdf
    • http://www.edgartownschool.org/uploads/files/55097194547.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090820cad020---33958901918.pdf
    • http://mazdooradda.com/userfiles/file/jusujivikoxapujozajuduxe.pdf
    • https://lukili.ch/UserFiles/files/xuvadodugutolovafu.pdf
    • http://rallyteamwalraven.nl/file/86246661979.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/89010077977.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908a5420a6b---61830263605.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d62bbcdb0---26589822357.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c25945a---vudubowezafopuzo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d8039081bddb0668b6e4dce7c21b56b1/67536891574.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d3ee11e6---soxekejifi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd6ea9c99---61561545398.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/293055e99b3ca3fcfe77632f77800f0d/52068090423.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=black+eyed+peas+song+where+is+the+love
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e943.bin
07c8aa8fb0f1e940ed700dd18427c1216f9551c8655ecb30a1e8d072837255c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 17236 bytes
font_01_sfnt_off00011671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16792 bytes
font_02_sfnt_off00012e88.bin
f6a7999fcff89fa6d7721b454fedbfaaf72e1ee599dc178b720ed9bcd49a098a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 11204 bytes