Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65bfb100c4f9984…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 02:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6873c3032d5bf194a921e2cb0c0dfd1 SHA-1: 789ba6ac03cf9a35fbd14b9959b6608d53d7f903 SHA-256: f65bfb100c4f9984ba6f4e35d8711715b94ab41b2e316a8ad1d4b03aeb4b1b9a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=action+cam+app+for+android
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161421606d92f8---24556465503.pdf
    • http://jdjcnc.com/upfolder/e/files/20210911210304.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c7e64d00b21c04eb8b2a5811c9faf783/zolojufuz.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/newonapasovofuxawibuk.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/42022285500.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/53271496462.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/lanobuf.pdf
    • http://canadianartistic.com/userfiles/file/rozoparavefolisigasimapir.pdf
    • https://dgssu.com/upfolder/e/files/20210905054734.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0754bd75---90766691662.pdf
    • http://forepic.com/_UploadFile/Images/file/maxezidurudokizepajum.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/voviof1tidh1bddk90qve7lvdd/96434677201.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614466c634764---48530057167.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3ebcde80---93941600930.pdf
    • http://saluteebenesseresas.it/userfiles/files/51408055178.pdf
    • http://watthaistuttgart.de/userfiles/file/zidoxexovobaxokopafop.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/gunejasomafafivusakon.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ef3ec560---jefumufuv.pdf
    • http://studioassociatoemc.com/userfiles/files/nonugepakefumiguwusejorep.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac25da7d69---56594235427.pdf
    • https://renetravel.ro/images/files/39597232828.pdf
    • http://unseretochter.ch/images/file/jepene.pdf
    • http://zamdq.com/filespath/files/20210903012326.pdf
    • https://kaparatt.com/images/File/97526672412.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136829f8f735---pubetinizapukiwife.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_off0000ba45.bin
1f650d203a1be0283249cdac76eb1f2d37181de5158c8849e10c1b746f9ce68a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16060 bytes
font_01_sfnt_off0000e384.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16792 bytes
font_02_sfnt_off0000fb9b.bin
47e73378dd5d6b63e29f9c6f3e3249239e2ad7903e3ab9492e8ef73deba2241b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10416 bytes