Malicious PDF — malware analysis report

Static analysis result for SHA-256 d818671e6e06290c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 09:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6ea3b964dc2ae68cfc8e5ca1d028af8 SHA-1: 73bbefb049c435e7f0ae0c84a45a7afc69b21843 SHA-256: d818671e6e06290c6716d1b7839605e9241f9a16ee232f74da83e06b9faf4f50
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, aiming to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=pubg+hack+apk+ios
    • https://iva-vietnam.com/userfiles/file/7669309046.pdf
    • http://htwy.com/upload/file/25078683486.pdf
    • https://0924055971.com/uploads/files/202109050613553402.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nu983qallfqsn07c7rmann56ro/kukudafe.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/refaperasejadovuluwavep.pdf
    • https://gbp.dropship-online.com/userfiles/files/15502849998.pdf
    • http://offerseir.com/basefile/offerseircom/files/xogokobub.pdf
    • http://www.santamyoga.be/images/file/rezosonofan.pdf
    • http://oa30us.com/userfiles/file/39112873587.pdf
    • http://jingyitech.com/uploadfile/79692954965.pdf
    • https://mygrind.ie/userfiles/file/71897735719.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb357df21---xoxugemomorileguvenu.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/17204351138.pdf
    • https://99shayari.in/userfiles/files/juronetotamobugoxokurefoz.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1fddad95452a157cb98bda570965130/86566092043.pdf
    • http://helder-effect.nl/userfiles/file/24722894446.pdf
    • https://noelex22.org/userfiles/file/pokigumusumivazopob.pdf
    • https://coevent.ru/upload/files/tunevipuxuvexerudosexedow.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/61653099127.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/15631201004.pdf
    • http://capesociety.ca/uploads/files/gukipa.pdf
    • http://blackivy.pl/userfiles/file/legirutewabalafemetiwodu.pdf
    • 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_off0000d4b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
font_01_sfnt_off0000ecc5.bin
c898705418d2e23a55cbf5a39b286f43246f46e5f2bea7bedec6146e39004940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 18564 bytes
font_02_sfnt_off00011d57.bin
16ba509cd91316914c78b8108d7f0baea66fe1097c891416e2cf315121f632de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10508 bytes

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