Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d9755088db9804…

MALICIOUS

PDF

87.8 KB Created: 2021-07-29 23:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aac030bca4855725923a7549211f068d SHA-1: 519eb0f3057eff539f577270da9821afea0d6b19 SHA-256: 16d9755088db98045aeee515c9967d7dc8f54eaf4765a31043f8035bd2b3e621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm designed to attract traffic, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/da0d6e4f4bd048d47aab609e912185b6/90555457848.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/63229869864.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/dajidir.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/82921594242.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/bukowuxibopulegazuxozito.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c063052109---81417776964.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l2h1d31i0gbp06o0sq3c1cme7u/pofufozexugaragaven.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/63606490a1a9e19cace732d9996b0bab/46864175488.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba754be2997---30457465200.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4bddd229---latos.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c380035c1d2---95264980678.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/samumu.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/33763886857.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/99356757148.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/6917386450.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/5836935739.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cbde9879240---luxemeje.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c8f3202---xokomifakuru.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f353f4b407---mupekuniduf.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/98702711343.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607279743f537---jelojumadasufifovo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/60c3cb827b5d365bba1b01fa81344652/wifotufajiwoxowada.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/fomuxeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chhichhore+full+movie+download+filmyzillaPDF 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17100 bytes
SHA-256: a0e3e33c575ad30f347a097c9ab369fb6bd8a3d42a19a219a2e0d7861092fe64
font_01_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 10932 bytes
SHA-256: 79bf6cde33bef3bbe3fffff1e05d02f5fc3d08d3a43ed221cae574912f0e95f0

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