Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbc7825e1b0425a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 11:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f87d8c16e80269b232289aa201e0555b SHA-1: 1c3da3b2b1e8d2fde87b86441f69c39a61701450 SHA-256: 7fbc7825e1b0425a7facf671c9c525451f444040ca342b6ab5f71ebadd94835f
196 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is a phishing lure, specifically a remote-support tool scam. It includes numerous embedded URLs pointing to disposable hosting and compromised CMS upload storage, suggesting an attempt to distribute malicious files. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'remote-support tool lure' heuristic strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://synerhu.ru/uplcv?utm_term=harmony+remote+android+tv PDF link annotation
    • http://nhahanghienminh68.com/upload/files/51963875212.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f986237cad9c40dcabb021a53d5e413a/91550568334.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/37473783850.pdfIn PDF document text
    • https://rintrans.com/files/kisilonabemoj.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/71008650987.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848343dce1---68546625474.pdfIn PDF document text
    • http://aquatherm-graz.at/files/66043582948.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/temipezididapunejum.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/28087838513.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/56490793459.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/46443730697.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/senupajidagituju.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/19881417859.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/27404837905.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/82856694753.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/48804743202.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109041133195305.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/7597860965.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/kuponuzom.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/17790181982.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/6159933159.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/22458039699.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/zesipulozasuwiwutilu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f77d1ce8575711ac16c815201ad84042/sojof.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xumelonopijifegikotope.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210911_5606C665B4C8FFF1.pdfIn PDF document text
    • 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_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10368 bytes
SHA-256: a2248c54d383cd277440b1a8fab95564f06c01de1e656806fe3d6239a16e547b
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 17876 bytes
SHA-256: 04300ed03bbe251c10ce8117c5055d8fa63b10029b8b51d4041bc702a227ebdf

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