Malicious PDF — malware analysis report

Static analysis result for SHA-256 43198027d0260b3d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b49f6d6216854b87d3bf45689a895feb SHA-1: 79664dbcdc2fd050f4620e259004fbfb8837c829 SHA-256: 43198027d0260b3da2312a71a33672ebedb04ae95e0a13965c71ea3ed7f7fece
116 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple suspicious URLs suggests the document's primary purpose is to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cuacuontoanthang.com/media/file/tepuzobepejuwagu.pdf In PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/sufagefidij.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fazitupizebezovomilokizir.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24500763847.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sixixix.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/50353123871.pdfIn PDF document text
    • https://eniedu.com/data/file/20210920171334.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/jasifazelupijibanifesiw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e91b60ccb8f5708043786ad909704cd8/rufetosujivivafez.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/kudodisozexur.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/96152112909.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb0b77e75---wusojedirawa.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/54371262681.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8ebdgfbvl20qc2dru68dj2pqok/xupibaxozikuvatanovuzibij.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/nijetisibidifuguseturak.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/fusovabetibe.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/zafijejemewumebufebid.pdfIn PDF document text
    • http://tykhchem.com/upload/files/72359115147.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/zaxipo.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/2117505135.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/juluzuvufavifelavamakirak.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d00bc005---6007103038.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/kawazexitodijiwuxezuvij.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a9eaf9d---fedanokokiluduji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=storm+pegasus+qr+codePDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 10936 bytes
SHA-256: b475b7ef1f0ab96c04a853863059328c992d72f5eb07c04460dc6ae20c8113e5
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 17744 bytes
SHA-256: ba12640c8e9948a60df524fca3866979e1da23275cf5fd14ed5ead272809f395