Malicious PDF — malware analysis report

Static analysis result for SHA-256 e297671dee6e9534…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d13730d607481402a43f43c574eb839d SHA-1: 8979f147107d8161947e392e15afb0e1e31df545 SHA-256: e297671dee6e95345576935ead2f7f6340b207424761c513134aa2bd93e894cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with specific rules indicating the use of compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous URLs, many pointing to unknown or potentially compromised domains, suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://produse-zilan.ro/files/21526259988.pdf In PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/99311975037.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/40819897454.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/17278289634.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/41681723996.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vutusuxijez.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bekego.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/18914802666.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/kutanewewepagoxajafe.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/gaxurigidoj.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vodiludofumovowob.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/lexugofexizisebanup.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dajs7d87qsft03v7j5o34rp44s/27680219867.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/xorir.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c48b61e1a---46667031551.pdfIn PDF document text
    • http://client.diffuse.info/files/75701858306.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/gerovowedexonodakelufob.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/50495401292.pdfIn PDF document text
    • https://recrut.com/files/files/mojijojipu.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/94597555835.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/67221918837.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/vodelifufewuvuk.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/54722334483.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161315b276350e---46011989676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+resource+monitorPDF 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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 17380 bytes
SHA-256: 165b31b6aa6fb62dd3a62c89a582b69395592e624f6a1d8673189b7a7fca0dc8
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10404 bytes
SHA-256: 39e89b255ee0167e163803ce70e1176ee4cf8a8c3a4ae6144f54787155e1455a
font_02_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1