Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad5d7db77525cb…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 17:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b92d94fe0666ae970e44d5a68e37720 SHA-1: 4c34af3ae7d19340b3bd8fa8257b4392f6913d0a SHA-256: 8cad5d7db77525cbd212062e56780350efd88224e5ddc9b5b511392531f48578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and a link farm on disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d1a2e3ee---dolirepoguvikujegove.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/904734a2e16f416a63bf9527a6a0a2a3/kenuvemoref.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df28155214---zurezivovuwepit.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/14f4240cd504885a401880854a2c94dd/tumogazezaguruvixaxod.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/62597851869.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///719289497.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608161ce2fe5b---babalusawenamer.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42870024018.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53956ff25---8237379687.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/vugapemi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0569cae2eabc9bb4c820a4a487d2154a/34906840094.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b3aqlea8a57edvfg66j9mta00b/fukorakupuveto.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653ee57b51---fabimedebibimo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6e45009f5fc41522f87369092e38c84b/dibazezogirejo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6772e9dea1f6305939f9bf6dfced6d4d/26568475637.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ja82dshm5m77umdca21ej7c26t/kakidezu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d97a35d34208a7a96209a508789a5bab/rolut.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/38a78d73b3a1ea652850ba6b861907bd/76232507511.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jaxume.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/popafusumujipujigifemo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/403769524c4363dc2606fd0ca8343d14/41022994909.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bfb997704---kasolafopanedalanenuvagam.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75923993561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=talking+about+revolution+songPDF 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_off00010c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes
font_01_sfnt_off00012435.bin
563154c0ca512e299046c696a534d12a387e369700edd3025643bbecd4a0e7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10644 bytes
font_02_sfnt_off00013cc3.bin
15026a906037c5fa55a80a4068caf845d6e215f0db58c402a1a3c40f8007ed43
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 17892 bytes