Malicious PDF — malware analysis report

Static analysis result for SHA-256 10be53b45158c5d1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 21:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd97f23d2c6e0e44a2f573bb275c6fb2 SHA-1: 0531ad2c9c1ed96d0d9f4f77261023fd1d7c1557 SHA-256: 10be53b45158c5d1dc4329b86551e4b745bbecd9da84fa5aed8ce12a298c6ab2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sigmabhp.pl/userfiles/file/dafugapanimij.pdf In PDF document text
    • http://juncheng.tw/upload/files/zudusibovozaratovigek.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/kumevowipubo.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/wipizunipew.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gogovosodugosemedas.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/zumipabivezoxajanomewa.pdfIn PDF document text
    • http://chapelguild.com/images/usr/60262027795.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/61258594759.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/57708275390.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/63194616498.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6bf82492d10fc5abfd3b9ce8327fcbda/67513293147.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/mejol.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/salarubatekigukat.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/ralelevutobuf.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136722a7f107---rezisuna.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/6184501796.pdfIn PDF document text
    • https://flomogroup.com/upload/files/xudemaduj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mj79pi5v7dgtll8unnd02d9se/1570754657.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/muwarulidepo.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/telopulomotajefopep.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vudozixose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+get+a+phone+off+safe+modePDF 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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 17844 bytes
SHA-256: 764aca7b909040db24c8731e7b1dbfd5b774b2abf89fdc639e478c9602f8d9d8
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 11000 bytes
SHA-256: 2f9a63d9ced070efb6b66b0ff6beb06eae37f315a7d4aa8b4a2450da3bec7174

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