Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ee2cbfe8b18848…

MALICIOUS

PDF

107.4 KB Created: 2021-06-19 02:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 639bae78ea42d69831f5b20529097889 SHA-1: 3fe88c46702a1a5db89012a81a876afbe109d5a7 SHA-256: 18ee2cbfe8b188489ff0ffa412070753abbdb811c6b67276cc7936496daaae77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://everest-c.ru/ckfinder/userfiles/files/14847261232.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17fb4a3c1---81478082278.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d13546d6---viwosijafosugaponilanexu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16073584088729---72913123589.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3219965fa---lixovuvubebolowugi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45977d7e5---70887880565.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd564fea7---liwuzon.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/4c04de518543dfd8c8473bd2afb2993b/80631644577.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609004aded4a4---lajepolomosenewura.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/u0uvpqdd5t4spntgdsem8d47oq/xuzazufabulokidomawabuv.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fc7822b9---luxexugawavopaponasubozul.pdf
    • https://ready4use.ru/uploads/files/92053268995.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/fexiravunosipibokanu.pdf
    • http://www.knickmeier.net/images/pageimg/file/1430796304.pdf
    • http://www.derbysignandgraphics.com/uploads/file/xobexejuzewajadad.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b1228c9d---59078660147.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e128455c22---17870677436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rom+wii+super+smash+bros+brawl
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016984.bin
9f63977782b70a6e61c25c653a4f6593488d7c559fa49c6bb3cad84857b07bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16984 5296 bytes
font_01_sfnt_off00017b69.bin
9448211c50a957fd4fef93badf779226248adcf457e12c6380d27bdf1048a97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B69 10996 bytes

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