Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9630882d414b6dc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 875c3bf090a40ef323940d6b6c363b6f SHA-1: 2edd90d14f5196a0120ebd86e36b45a838e40361 SHA-256: b9630882d414b6dc9395754a98066f4185a521655001c13bde1dc854f7c3665c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely exploiting PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/8702689468.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/72b261c327a5ace04358b7579bbcabe6/wunijeti.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210615230312_877480616.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/59614355340.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/siber.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052221340473499.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/23673143288.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/10546266812.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/tegufigof.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/55205483221.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf2049dc3---xeluvaguxivisupepabaduz.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/18641971563.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/7308337013.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/visolelowepigumigusolaxa.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/219b88ff32b40e2f80fa68776978d506/72420242803.pdfIn PDF document text
    • http://shosholoza.de/file/kabanabiseduvejew.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23423b982---wukavotazanume.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/16e8ee5ece2cc9e9537c8b4d2070d27d/mujexubukagod.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/11363983785.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210817054649.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/9871771092.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52e56096a---53283900875.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/45425291012.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/72995208537.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cfe6748a954ab562aab4290de0fb874a/zonokibodifite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cambridge+latin+course+book+1+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 11380 bytes
SHA-256: 847dccc348dc5e3947699085b41c6e7ca8ab062d04859734624e483f9ed27fd6
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 17412 bytes
SHA-256: 8a06f5e5e6a5ba32f430b9bd41eb1131b80270147449c429fc6ce3cf25db37e3

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