Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8e3fdce759960b…

MALICIOUS

PDF

92.2 KB Created: 2021-09-08 07:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 538bbbd52fe13e770b6135aad59dda95 SHA-1: fb8a944d3bed223d53aabca9dcc0fd5679581d97 SHA-256: 6f8e3fdce759960ba881038545aa47820b729e987c5111f7134043a9b1e668f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the detection results point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/30711255868.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2e3cedca0c50e77469340c2f25e5ff6d/nukobegej.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83e16799---7837863727.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/dipisezumakasunalaxasole.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/44558004966.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/kibamudulaluvoru.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/98787217560.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/79299291042.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109051903052895.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/3298693908.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2844d170eb0521e2a8ef967427121fac/fovibutunipanet.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wojelujudidemojozidurij.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb7e9bbba0---kinadipisemuziduzotisin.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/kusesulol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064b08d3f7---78791047358.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/91614323981.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sagubulutev.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/biwafemelenakudaf.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/jejiwuxena.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/63005849337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=manuale+d%27amore+3+cast+completoPDF 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_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 10884 bytes
SHA-256: 9e04a895466dee3104d936bbaf95e2df4cd6f346153261be4c1f93571264420a
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 21028 bytes
SHA-256: 2af5c22a704faa44eb3f68d94131f45236311ae2f3cdda22ef6e07d1a355e06c