Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d0e575feba37bf…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 18:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90d0706960fbc22a71a73c4ff068bba2 SHA-1: f2a25e7acefb7c04b4df1df4939c5a9a222f1457 SHA-256: f8d0e575feba37bfebb6edd7727d1ede5feabe498167ea287ba52d19a337ee0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://restavracia02.com/userfiles/file/konovikonakitaxas.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/72622476475.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/84806512707.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d562ca39---52617201919.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/73137585106.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/radesi.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/derepejorikimofozibi.pdfIn PDF document text
    • http://zzquansu.cn/d/files/riximenosakavafu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210702_113F0DEF0CC15144.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af9a2d987---60242836790.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/9044117239.pdfIn PDF document text
    • http://inphilong.com/upload/files/95139456201.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pelexi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/bumarozed.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611afbc6ee5a3---52496576097.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/31739390704.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/39264737935.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/71162691983.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8bc1403b1---108809595.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a07b689601b1d0f0753854e1c88075c/lanop.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2633ea67be---fipabeleg.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevevo.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/36330825145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+idiot+brain+%D8%A8%D8%A7%D9%84%D8%B9%D8%B1%D8%A8%D9%8A+pdfPDF 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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 10484 bytes
SHA-256: dcbdf7ad0e06ffa480fe094f8aa5c0002f11f01fd2e6534e6fd24b4ed3dfa5ee
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 17396 bytes
SHA-256: 52090ead2f9828ab70846f02f859f28bff8ebc2f9a4df958a585d9e4a8ed0d44
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 19952 bytes
SHA-256: 2f1b679cee454abef4054c00e99dbb9a95200af401819d5ff32b5a4fb7bfc426

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