Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f43f4a6ae5e389…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 18:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 064af0ece1f338f1d5faf32c0647f52b SHA-1: 9d6857f814d73f45da65335ffe5827f67b31d7e3 SHA-256: b7f43f4a6ae5e38980610090ad269577c1467c19f038dfbc0c70dc72ba5285e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of links on compromised CMS uploads suggests an attempt to leverage trusted domains for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://manorhair.com/uploads/files/202109022019559855.pdf In PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/zekagiligedobonivaluxune.pdfIn PDF document text
    • http://digifast.cz/userfiles/87493298558.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/pulefasupufivarewezipuwe.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kegup.pdfIn PDF document text
    • https://alpinashop.bg/files/56690775088.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fodezijasoseluvan.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kifidibaj.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/29647298060.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/29870237190.pdfIn PDF document text
    • https://aneri12.eu/res/file/giwes.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a154d29---vibinitivu.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/59409006168.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4c2eb407---25488473494.pdfIn PDF document text
    • http://santehnika34.ru/images/file/wegoxovanum.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/nonexiju.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109050829122397.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/puvobesak.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210903_011504.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/visibisuniguzurofi.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/56088230955.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/bobilevokumiv.pdfIn PDF document text
    • http://gekon.net/userfiles/file/33845742946.pdfIn PDF document text
    • https://slide-bearing.com/d/files/siberezutosozobipop.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/96672438398.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/48438212072.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f83a42de6---kuxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=office+365+with+crack+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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 18248 bytes
SHA-256: e64adf417ff693284dece815bd84793317970b0e38b57e2b4c5b11987cafa548
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 11084 bytes
SHA-256: 8c5adddc57a00aa824c3c2e8ffae232c6cc309498c7571286f84fb3039899f86