Malicious PDF — malware analysis report

Static analysis result for SHA-256 640661273e77df77…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d146d0afe0f25f952ddd8b7f1b9136c0 SHA-1: 9198d2b516d74cd5b8232c8c56eb96473f4605e5 SHA-256: 640661273e77df77b1a59d1e259ec9a365aeb36510ed9857ceeaef36363c6f7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The heuristic firings indicate the PDF acts as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4d86e442c4ec8292f1060a0082894977/78374089137.pdf In PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/62973895364.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9c0177ace10f809eebb874b64ae86c3b/31135292553.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mawavokevimikitutoj.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0553b425bf47a5aa3ceea051cb7ca6ff/fedom.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/rujeninozerivopato.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee54e446b---mawovajakinulegoginimiw.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/pakumuduzamivi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/55572234427.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zexatesepine.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/42277216628.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/39249541150.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/26920444829.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/boderiwakob.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/woruvubejedepar.pdfIn PDF document text
    • http://kalikraft.com/images/file/midojevuromadekub.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/40817363118.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/vosofedapibuvavoputigowur.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/68385950206.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e951dfe6276db1be93efff7ba59dd263/zodosawopudadixot.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mujewomop.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/25497442803.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089485c8884e---37997937433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=let+it+snow+text+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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10328 bytes
SHA-256: 6569d923918f9bcaa098bb8c6a42f3fda50b394e1470e96ef7c2132ff59c5779
font_02_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 17780 bytes
SHA-256: d85b9bc51b2f4fed23a85d3c3504f03441b7d836d1df2e762128cb36f81ee029

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