Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8023a30cc3443eb…

MALICIOUS

PDF

86.4 KB Created: 2021-08-25 00:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89a16f988ee1768949dc17d3a9932ac1 SHA-1: b08bdb41d1c18f0a9db06e3075b40e6bb76613d2 SHA-256: a8023a30cc3443eb696351e79a1ed3618930391dc093babf57d197fbc5bcbb52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage search engine optimization on disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=all+colours+minecraft PDF link annotation
    • https://www.paseppe.gr/ckfinder/userfiles/files/ralidobeb.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kivoluroresud.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/18c199917a83ce74d67988e03d4e54c8/99875835293.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/77655706004.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc395a9ef33---zebibasonaje.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-6/20210606141057690953.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a0ba4c10---14005967682.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/70321718599.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/09a28221e23b5732e544e07daff67e66/tevakuperelatamamom.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wuroxuvi.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/49074732550.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/dixufimozikofamu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/bigiresaxalezaj.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ac657ce2d---nigafupometejosube.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23a3ded27---tobedonasifunopexebizije.pdfIn PDF document text
    • http://greenbrier101.com/userimages/denupefi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d404537---neregirajokorinevelizes.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608397526668d---1142533298.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fdfic0ps16l3ibjh92rvek0hi5/741070867.pdfIn PDF document text
    • http://wych123.com/upload/files/37417189117.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210812/files/20210812141846.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pozifuwi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sobebikuzasote.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/51357413834.pdfIn PDF document text
    • 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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 17148 bytes
SHA-256: d6d46b6ea563f3fe9adc5ce74a99e6d8cb75400fcf6d3c91ac5cd30d3c00f20d
font_02_sfnt_off000132ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 10580 bytes
SHA-256: c2e137377601ff00fc0d77a78555929a6941af055de8edb229b25796297c34cc

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