Malicious PDF — malware analysis report

Static analysis result for SHA-256 657749fae94fdf74…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 01:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6a07f7d13ae167d77bfe798b87b0198 SHA-1: 729025ecd58a49ca075850b5211bf3df63428d46 SHA-256: 657749fae94fdf746fa32e16fda1cb13634c3770af39ddc8300be7636a8a1ba0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a redirection mechanism. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://triple-a.co.th/ckfinder/userfiles/files/5623833614.pdf In PDF document text
    • http://mawratanews.com/armedia/uploads/files/komugazasumaduwiwan.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210907130625.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/57680818035.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3bd0e31a7---23428154110.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bulusaganotulapoli.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210909_69622BA7B7F44EF7.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/botara.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/mebisunibukuzunogal.pdfIn PDF document text
    • https://best-label.com/upload/files/ridatepivi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82373055374.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1040e4fd929371108c8113d61e38942b/82323142452.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/33197518796.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/tobinopifusisozaxeg.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0777246ebd737ac7817257e41e99a4c5/99542462183.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lazefox.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/maguwagofefelu.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/keridagisu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mujorimatekiseduxuzo.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/folepufatapegalefipu.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/vabopavagupijawokef.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/divodadupagov.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/65014484649.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b40046cc---83996972608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pixel+car+racer+download+apkPDF 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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 10524 bytes
SHA-256: 2c8e795d8bdb26e974628de1f9953619e208c2bc58c3884ebc6bac9a2a2bd552
font_02_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16984 bytes
SHA-256: 1dd21b6792f146e6101a7988c0c28b5e419772c4a16e7e7c9953e835f9c60234