Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf5cdc3ef68f39d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 06:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 642721b35893b1d95a22530292e048b3 SHA-1: 268816c84692e2d9e143e6de43da054c8b5401f6 SHA-256: 9cf5cdc3ef68f39d66098290e5e1b708b86252178b96055e423724bc4cb8b001
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The document's structure suggests it's an image-based lure designed to trick users into clicking external links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gesundezellen.com/neu/userfiles/file/gurud.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/41248b4e34327b48a8baa5b8b5b541c6/xusiloranajifivinom.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/62877284341.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xifoxonado.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70cb3dae583d0f02793fd287fea4756b/49769538329.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/33857762889.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/gawawif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4868451a---53327752724.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/disekapujinipijupi.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/gulukimizeles.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7373d4ce0---vefuwepegiwurulebojavagot.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/1948519134.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/sotuwejivoju.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/gofesupebaborez.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/gajufowowomoxawizipedej.pdfIn PDF document text
    • http://arsvet.ru/img/upload/fosavinufivarovadaxode.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/87389654164.pdfIn PDF document text
    • https://birudongker.com/contents/files/65133194523.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ackte64h37pd70pfqd7dl6dj9u/tuduximekinofen.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85808497916.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/50429011115.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/bexajikevu.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/xurelowoxenimajonig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+insert+a+picture+into+another+picture+on+androidPDF 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_off0000b26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 14284 bytes
SHA-256: ce03a3cba426dfe58e216c4161436b6d13806257d076c5a6a18c73aae675b39c
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10740 bytes
SHA-256: da3227eac37484c17c819d49dc618f213e9bd0f07fa52da14e81d29e82ce1bb4