Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8a62a6816fe771…

MALICIOUS

PDF

79.4 KB Created: 2021-07-14 02:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: caea3225e2724a626d4f78ca100f7433 SHA-1: 8a2d2123d7d40d4bfe8af1d2cbf4187b819ca7e9 SHA-256: 5b8a62a6816fe771cd200b92053ae6a99c79c4db0c7fe391168c70ee79732290
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are also PDFs hosted on compromised CMS upload storage. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/db1e7e0344499f4db61693b17ce92656/sonabolevodavuk.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a759bba6c94---jizuzexefaxigo.pdfIn PDF document text
    • https://mmszke.hu/files/file/vuzubolip.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/dakerirejovapob.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4064df69ab6b4338f0a462c9b85519a1/pibexadawamutemodok.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608773fb4420c---52730598078.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/67009348872.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1f3e2b4e---dexozerudum.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2f619bcce14b792e7fb7d61e08e985c5/kumozegoponamuferufe.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/37459001016.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/24578160169.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/15fa064af78ab39e4ed8f5cc9e2e6ea4/nebukabeganufafixelalunet.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d8864809036---sosesopoju.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/73510461814.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/21490851320.pdfIn PDF document text
    • http://yongqingtech.com/d/files/munadatexowovaxa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d7f3914c---67924744526.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8epatcbhajahgh524f009qnug3/kotebijope.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3r1stqh99lqrmpevefbgft5hqp/42943466774.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2mg9s7oiqn97946olgbjt6asq2/96773586323.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/amu6i731f06bmk0eh2fi3jftj2/13387833747.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab9c1eca3---16610457480.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/96605614711.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/j98ke87ib76tgae58sk9eoetm0/49667058257.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/83586696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+offspring+2020PDF 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_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 10536 bytes
SHA-256: 3457f9ccef53ac55c6b9db1cd82d06cf383a42889987cbdce654b036dc90049a
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 17500 bytes
SHA-256: 2e5823ec99f98754346c4ac792bcfc67e5ef2fd71dff5b90ac7645aba8b7f3da