Malicious PDF — malware analysis report

Static analysis result for SHA-256 992d4ed962284812…

MALICIOUS

PDF

74.4 KB Created: 2021-09-30 22:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f55124e21417d4ded1327fdfa44e78a SHA-1: a95b05b68cb82819f685edb0afcb678784801901 SHA-256: 992d4ed96228481217d106d38f8a224297e8d5dd971e6ac6625067bc36bab142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://allytemp.ru/uplcv?utm_term=fisiologia+boron+pdf
    • http://sieuthibds.net/images/files/jalirojufuredewasaju.pdf
    • https://ceccarbotosani.ro/userfiles/file/51401632563.pdf
    • http://ipceurope.com/assets/file/bagotilamus.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/97275092656.pdf
    • http://autoservizimensi.it/images/fck/file/63188670777.pdf
    • http://ristoranteibucanieri.it/userfiles/files/soduliwevivivolesek.pdf
    • https://tezerwatch.com/file/upload/files/09-18-04-07-07-70.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68kej1nbtkbijj56014mr723rj/taviralevoxekajede.pdf
    • https://duel.pl/userfiles/file/budabadek.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/mozudulukixakivumizit.pdf
    • https://mimpiindahsatu.com/contents/files/21976473854.pdf
    • https://fasaac.org/temp/files/69479138462.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/vefuxubaredil.pdf
    • https://5uempat.com/contents/files/jeteni.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cs2ul7jl9hect6ta4kd78clj06/guroki.pdf
    • http://hyunsin.net/userfiles/file/29121659479.pdf
    • http://www.fashiongale.ro/userfiles/files/42814927780.pdf
    • http://floralojistik.com/userfiles/file/86156629006.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c374cf645---nurotijemovigi.pdf
    • http://griesvoegwerken.nl/UserFiles/file/jiwivezezubudazikup.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_off0000b82c.bin
87f613fede46be05d562af44087d7261f76ad37d5eb8dc48cc83270d60bf59de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 10560 bytes
font_01_sfnt_off0000cfd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 16792 bytes
font_02_sfnt_off0000e7e8.bin
d8281116c92a94296c5b7b9bdc540ceb50353dff7a1f75ee88cde83bef7eb45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 20088 bytes

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