Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90e4771e9cfe6c5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 13:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aba6036030c7f28de7bcb05e8143233c SHA-1: 2dcb37536b809e269fa91e06a708a3643ddc5036 SHA-256: f90e4771e9cfe6c5a11303dfb5cecc2ece3072204ff2c052496feceb454bb6fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sushimura1.com/uploads/files/lavova.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a2cba97ef3b37b2da03c752502743832/sozafogomumabifanixiz.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/kokunixamekiko.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/78207848636.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/mebexuwofizesosa.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/tukabame.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rufazalodesebovo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1267f0bca3---munudedax.pdfIn PDF document text
    • https://mfdesign.hu/files/file/54236626189.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/50187816535.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/91597137474.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/24026026861.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/to53lmbcai2jcpaetf6a6v4h07/nogurawebotesulomuzot.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/82361707783.pdfIn PDF document text
    • http://plncse.hu/php_data/file/39305999328.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8fb68524136909577d2f65cc6607f1c4/83528019204.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/jewovekisexajojopinipeduz.pdfIn PDF document text
    • https://emmaushuis.org/pages/88378225696.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/28465817738.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9t9digfqavsecvag4pmcbis168/vewudagabexutodape.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/parojivilusi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/58414104120.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/91978399130.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0e3e63067b7f67dddf15bf9edae9a270/52489274289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pemikiran+neoplatonisme+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/kamuxumovokunazujepuzul.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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 18136 bytes
SHA-256: a194e1b2f4a3fe2ad1df7a9ecffa3e083111a3fd81fc0d558077d9a81770b3e5
font_01_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10752 bytes
SHA-256: 5f48f0b1854ffdb20eb727ae6f02a28e1f44f7a3e25a95a8d376ade8530764cc
font_02_sfnt_off00014071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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