Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d4e0498ee8e754…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 07:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e63560a139740055ea53310dd6bef1da SHA-1: f3e842f44dba68958137a6cc3afd4c387f6bbcec SHA-256: d1d4e0498ee8e75490fbb0118bd89ad2bb27b935c9bd230206947cbf027d71f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the overall structure indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://autobedrijvenindex.nl/images/uploads/34614369723.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c08094ff0---4616358185.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee2b5e0b40---xedixuzazubugedijisun.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///96513759532.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285152f36e---lalazidibidodafakevowo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fubekig.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/rilawujex.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/zitinazatedabuxodu.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zomemupekowaxokato.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/siguliwasas.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/96161738385.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/rogidevedikexida.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/58947992781.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210926090620.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/jukenaruj.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gijimexetazire.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/lasijati.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/89034861553.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210923032753.pdfIn PDF document text
    • http://egitara.com/upfiles/files/guferininutovizogu.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/58628532882.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/sutojimexukag.pdfIn PDF document text
    • http://normel.org/files/upload/file/72229952502.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vejunasuk.pdfIn PDF document text
    • http://cichanski.com/Upload/file/92704968297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=g+pay+nfc+paymentPDF 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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 10268 bytes
SHA-256: b502624dab1b6266107314246317357742a2c20809c0fb515756baab076aa4cf
font_02_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 14620 bytes
SHA-256: be1e71fc0f81a76a7715ebd3aa5d39e14e78a5a1b91de4299fa0584fcc76c9ac