Malicious PDF — malware analysis report

Static analysis result for SHA-256 e797c50419708706…

MALICIOUS

PDF

101.7 KB Created: 2021-09-19 06:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 351357431696125827345640d962054b SHA-1: 9fe757fa222f3e4064ee8d24d6f4e9ba5b14a5d5 SHA-256: e797c504197087065891b4d2476dcaa13f86574a08ad5ab1d91c356b6551e9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several heuristics pointing to a link farm hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pagyesa.org/userfiles/file/20210903115126.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/nuwokinurigijofilop.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/34539969368.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/suxalikakefobuwomoxom.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/4359782305.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/41673936505.pdfIn PDF document text
    • http://ducnhua.com/upload/files/79063891247.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43986060730.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/romevolajugopunefikezuza.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902003537.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/buvidupibakumepun.pdfIn PDF document text
    • https://edgecs.com/documents/kajemudizabozuzubegarani.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614605fc12ea9---mafidemixugijutug.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/76627268896.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cb4146bf---6881160447.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/79525361197.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8407b6b4---garojawijapupe.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210905_0B518AE74DBF07DB.pdfIn PDF document text
    • http://delve-cr.com/uploads/90800561951.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/47284449211.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/farewuwuwuxudewekemumoxog.pdfIn PDF document text
    • http://elitacasa.it/images/file/57886104171.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/manitijipiwewuzepen.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407dbb6da10---juwewosonelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bloons+fps+hackPDF 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_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 10300 bytes
SHA-256: cfbe4bd0620296977af9db6c56c98fae1b600059e382491693572a073ea8b91c
font_01_sfnt_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 19308 bytes
SHA-256: 14d864ab3563ae0ae519014e155706a7fa065820576b87a668a363813e5792a6
font_02_sfnt_off000170dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1