Malicious PDF — malware analysis report

Static analysis result for SHA-256 957634d6689cecb2…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 17:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03fd6a224df5fec64583c2a8f84b68ae SHA-1: 8a5c783111b4ebd04edebb1823ca577198087a63 SHA-256: 957634d6689cecb204d3f110085f18369270055fa2ad5e7e2dacae870afc2e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=i+shop+therefore+i+am+analysis
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e06cda183---79483137202.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/48a95d5f9616543bbbfeb006d8f42011/39902334484.pdf
    • https://coil.hk/upload/files/72129507941.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7cacd2dc---90840339248.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160780712c5391---32647789892.pdf
    • http://bobas24.pl/Upload/file/furud.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a9d69aed---nudixafofur.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/wefutixu.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d1802f1c7022fb1a3a9af23f7fb406fd/venerawasiviwafajuduvatas.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088012b069ce---bekokekakizu.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bedc30d9a6a5ed654f9352c9a438df01/77116408317.pdf
    • https://atl-50.com/files/file/zuwafovivenofotujija.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e33991a---raworirerokaduvur.pdf
    • http://phatnang.com/media/ftp/file/54690975495.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaea526a51---mofakulugiwi.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607973c9b635e---72304970513.pdf
    • https://stopserv.ru/files/file/33359224290.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1fd4bde2---lujajazajaralifosej.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8e99bbd9d188f493439e50c2bfe8d607/18678857579.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6eb19f06732fba74edf4934c27faf9e5/gudabupuv.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6b27od4k1pbeuigl2j5as13jro/xafiniwizuvesirafe.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b755c9d9ee---18394443476.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0e7e063cecfdbb370377a17e92e608cd/96899453929.pdf
    • https://atcotourismtravel.com/userfiles/file/wunevipuja.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001064a.bin
5bbad2e7fe2b1d4e07f668c5d3384fbf8540022283a8acc137d48c7765fe1f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10688 bytes
font_01_sfnt_off00011e9e.bin
2ac5b01d40e49e3815aa4f3ec42c1a6ba77275e0ffa7b6511bb932bece27a040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 17092 bytes
font_02_sfnt_off00014b15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B15 16792 bytes

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