Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd68544251c10bc…

MALICIOUS

PDF

62.2 KB Created: 2021-09-11 08:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f86ad7eb926e41ec6a32031478bd5d4f SHA-1: 165a6270bdcb0f621c67a3c5234e2f60e7a6732a SHA-256: 9dd68544251c10bc0c33b0e026d349c989e197362ff6e77716cece7d78375608
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6412

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=download+ufo+vpn+apk PDF link annotation
    • https://nmg.lv/img/uploads/files/60547982142.pdfIn PDF document text
    • https://magerp.org/upload/files/19853298719.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/juboxikabisimuvatakipoma.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d2a4a0d5---vibojubarodutebinijuri.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/basasakonogirazagomab.pdfIn PDF document text
    • http://cplastik.cz/data/cms/file/71569399847.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2934ce8299817413df1d067d9a3cc86b/93777052878.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161313aa106acb---37874977776.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/25198990919.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f354d5328---lilivebutal.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/42867691346.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/videla.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59454ab867d5a12360e887c26fcb28a0/xedubabaraxonop.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/97490879359.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/83624643456.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a2c497a64b097f38b8e5fb3df7556a52/72782156756.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/44408185189.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/69303988953.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bavik.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/9964301115.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/66394242317.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdfIn PDF document text
    • http://wsm.hk/images/files/bobisibilupapuruzakotapev.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 18544 bytes
SHA-256: 7a9455a86d0eb7c47acd8929140114276aa8873da4ffde1eb2e80a4fcab43c62

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