Malicious PDF — malware analysis report

Static analysis result for SHA-256 716d023f6fc8df09…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 00:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a77ddd46af5da085c80938d34f863229 SHA-1: 58d394f5977160835d60548862d6c5ad6ddfb46e SHA-256: 716d023f6fc8df09ddd0d5470241bce63e7c6beb0d2971751276dbcb65c6f55c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous URLs associated with compromised CMS uploads and disposable hosting strongly suggests a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ekachaiguitarist.com/ckfinder/userfiles/files/daviwimifa.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7f6d48c7dc1ed3b28d3831ba3a1e7a7e/38430597030.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/gedafeliboberazato.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89b29785e---48193327904.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d1395751ff7ae13a4cf3991f70613b49/44271720041.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/gakomi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mubifomekofu.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/36528712772.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag72j8qft14v63cg09illa4fh5/29132933600.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/93331375025.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/52525809240.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d558aeedb92---35573087115.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qn4219v85rjmdq1bvt93363to7/vufirukopurego.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/85940290087.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2582d521c---80097446402.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/582f3df8c43be52ed1e987eb205150f0/kumobarexeze.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1b90d3fe---jenapifuvojafakabakunipon.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/82683889991.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q8865mkdk75bslou7v9td98ri0/panuzibulozuwabixofoxipez.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/mizigugo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76254c5707---jajexagonajap.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/nejezunogemavizikanuvep.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/xomedereme.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/35575358358.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d59f36061---43574643293.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/60253851110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=centralized+database+management+system+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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 11064 bytes
SHA-256: 39fa069aed0bc224b1eca63f8ef93a9efb91b1cd84e35e952bafdd38d697d55c
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17140 bytes
SHA-256: a18c4d0c793575b894c8dcf79795be342c9f0cbc4c0b99ce74c9ccfdc548288b

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