Malicious PDF — malware analysis report

Static analysis result for SHA-256 793203f5163e173b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 19:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25d48705e4f15db823040cf1c95dd224 SHA-1: 10eef41301a16656c82dbfd102713030a1820415 SHA-256: 793203f5163e173b3c60aa84d41553054f8a9af586763754431cadcfb3860a5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abwjefferson.com/uploads/files/49149899725.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76c0198c1---75480307550.pdfIn PDF document text
    • http://elitacasa.it/images/file/84473601238.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/xekaxeromedozazodafori.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///kiwitutopukisitifa.pdfIn PDF document text
    • https://zhansq.cn/upload/file/polem.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/86852735473.pdfIn PDF document text
    • https://isleo.com/i_photos/file/19713460487.pdfIn PDF document text
    • http://robedecreateur.com/img/files/xumiz.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/60244729431.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/283021a8b979bdcdd9ce32568d2dd3ae.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210902135431.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090510143173499.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/84556715559.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423626ced5d---88095910355.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/95492146663.pdfIn PDF document text
    • http://186086.com/upload/files/96959971192.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/wewasemajugoliwer.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/fonipuleze.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/21208694223.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437bb9be38---povakamonugilawutuvuri.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/16442726703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nicco+app+downloadPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 18652 bytes
SHA-256: a380737ef0a72d6130fc8b49394e917cf5dd4782fd7c4fa36492056784997aa9
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10072 bytes
SHA-256: a8f15498df913c98d4f6fce578e4e27d8a131385948f26558dd1276711b738d6