Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eb02df801cf4f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 22:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a88be0da63122290a4723db42f57b2fb SHA-1: cace381b48f1817af1a290d54fb9d0310270977b SHA-256: 10eb02df801cf4f583a2557ec51fd34ba86d8e3805962243e51eb9bb380c18de
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous links pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS upload directories or disposable hosting. The ClamAV detection further supports its malicious nature, likely serving as a lure to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ekaplast.site/admin/ckfinder/userfiles/files/73260027769.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/93094118927.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vifozuno.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f93909959---vojate.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/buwugapeweronutoxatigo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849379c00bf---63298760462.pdfIn PDF document text
    • http://4bx.pl/public/file/rijepeloxobutixe.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/95589082477.pdfIn PDF document text
    • https://nistd.in/userfiles/file/15813582429.pdfIn PDF document text
    • http://3q1p.com/upload/file/2108131937596333776epwislood14.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45fcab994---68807765846.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/82ehpj4asb0p68nmmcj2mapug1/tilijujopijujorodux.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/610bf466247d92bc9111e0c2e85c6be5/39903954564.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/93430971014.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/ledulimoduvoluwabivit.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502182814725663.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844687675ce---72304372175.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/xoxanavijefarikepize.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sukogobuluvufanegasamon.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/af98316b0f4557da9a119fc72b7f0059/21831240787.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb1b7b0bb1---5492603994.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/41976433453.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/tudizulenejoson.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/pedasawovebuzazibame.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/75848864517.pdfIn PDF document text
    • https://ienter.bg/files/fexebavizesejim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+endothermic+reactionPDF 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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10416 bytes
SHA-256: c7213a6e642e14308ba411febb507ae5e3fe8a51d322c01c8b4fccc1adc1f3ef
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 17704 bytes
SHA-256: b390886a1bde6fc825331a9624d070a4ec776cfb005db4909eb5bb109ea8a5f2
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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