Malicious PDF — malware analysis report

Static analysis result for SHA-256 9deee38f633cd510…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 14:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f154934c02a178ae12d3a728e3d6308 SHA-1: a050ff8e2d56e8afce08c9f2fa647605eb3ed029 SHA-256: 9deee38f633cd510cc4e7e57f4380023580945d3ecd26de21da76bac7bb717a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to instruct the user to open a password-protected archive, a common tactic to bypass gateway scanning and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://varida-tech.com/ckfinder/userfiles/files/57172425992.pdf In PDF document text
    • http://hausdergesundheit.net/userfiles/files/51866189903.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79322396230.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/46608396487.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/66080011583.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/34833584775.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/53909639164.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/63022889873.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/ramogakubazup.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/nowilotikeze.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/42454736339.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/runilojajuwofutexunemas.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/73077908641.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/kuvozakiwixiwigesuvoma.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/008e6962fc1718c993564397f94954f4/3659395588.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/gixukabepi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa383b286d8edb199f206cbe0290faf2/rovaf.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2630dfd4---2100261193.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xemadukabofaziwozed.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/pudadikibiferovarajivov.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/danagodunozosu.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/veluperazatuxel.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/valapisaxoriwuzewomafarof.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7a888b97---sawugetotaverarozuvup.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/92193012237.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/fosij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+apps+on+memory+card+from+play+storePDF 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 17432 bytes
SHA-256: c5ecdad2fa2d15605f6b8d699aaa1b513988b33c50336dff25a993d6ee889bf9
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 10880 bytes
SHA-256: c5da5faaec74cfcf9cedb145765dbf9bd5f845a4a52109f3020c11dbffc57362

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