Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a47798af04f8b4e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-29 22:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f3904ed44ce38d75650d0a465c9b7e2 SHA-1: f42954eab24ebc352e81f124c5b983b44bcf72a0 SHA-256: 8a47798af04f8b4e30b1a9527202ab66db02313f1b159daae3b4125ee0f07b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=how+to+doom+eternal PDF link annotation
    • http://www.zaluziemalina.cz/userfiles/file/jewerunifumedezetisera.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/nutulisoxenigezuniwamad.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/0c6d0d6791d04fdfd3c1739f4acce63e/68433890029.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/fuxuvigurade.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/wejatobexewajewabok.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/68951873011.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/tefutuxuluxododox.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/momafuwiteramoz.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a9df5ma7h7kle1mmkbfjjv3ts1/23750451497.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/35300295127.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/9384823834.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f22bdeaa---72319648648.pdfIn PDF document text
    • http://humanlitech.com/files/files/mivofewagemukifofa.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/kizapowukojaxa.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/29505807175.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/suziveva.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rotavebudoranekudoziwujig.pdfIn PDF document text
    • https://actorconseil.com/files/file/54604553068.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u3govemmj7fumeut9r12q5esr4/vikosapegovusozuk.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcda77b6ee0---molumorodimixedu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/33161738874.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edf196c13da---vojonuwofasapubolim.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/47780745796.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/56890227803.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jalima.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_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10224 bytes
SHA-256: 7b5cdfeac7b1da11c1e50112f4492fac07c3a278ed7192f8f13fec86f79ef962
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16688 bytes
SHA-256: 3904dd29c324a6c55f0f99ca857fdf37cc8ac5a76e620a34a27286e8695e16de
font_02_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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