Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f7d602731d2a43…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 09:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51bcb842c94190979aed13b0e9e4e036 SHA-1: 679518fd405f48ffd98b3f66e222de38905be267 SHA-256: 81f7d602731d2a43041f378c694be0f497f12f45bcd1d27524f46b377bd8adbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161277d1ba695f---nalobefisuno.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131745d95352---82140391626.pdfIn PDF document text
    • https://kawanmto.com/contents//files/91501128199.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/volejixosototolubejudes.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b91e7fe4aeee15ab8608b7b4f1676b52/66820153642.pdfIn PDF document text
    • http://goldmustang.com/files/files/83756103100.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/naxibomexezisurisejimifi.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/59059021510.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/jufigo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe029384f---64194107113.pdfIn PDF document text
    • https://hgb.se/filer/file/29883813648.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796be2e41c8---widupikularufuwide.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/36216193263.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/zovawujibopetep.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2132fd93c6e519add95ee23d3d61850c/54823604380.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db386c7fed---7236698961.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/bivilinavoralewipix.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gv6hrtong149ler9s5k47548j0/89189471369.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/mivugifewi.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3834fb85---kupapixajulijajabu.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/53834307345.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/12218479362.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/21a326bb7b78ec23785a4237067abfbe/7437283081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=intrinsic+motivation+definition+pdfPDF 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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 15316 bytes
SHA-256: 8434aae30b92adf01d616b7d1d9b5bb4b781625bfeff39d7677badd406f3f452
font_01_sfnt_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 10752 bytes
SHA-256: 38588bc71e220266e200d4c1faecef88b9be219cea69c9018831d88966b2b460
font_02_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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