Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5825adc508ebd6…

MALICIOUS

PDF

107.9 KB Created: 2021-06-29 03:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3e0bf372498fb2871bda3065d5400c06 SHA-1: 073b377e9fd3632b8c6aaf505f7173bef0dbcb6d SHA-256: ae5825adc508ebd681428c943e8cc8b9e1818ba8ea59530c3899f72c33e5dd72
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://srldirect.com/ckfinder/userfiles/files/wujenijab.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/57573720208.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/48ce2c85b89d4c69b68b30356392574e/28537931273.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1caf0108b2---buwudotakadudozebe.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/simitorixa.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/rigurubofikivawumenutuke.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ec97b46aa2bba034dcf5b58f34b5315e/dekenofizowikewevibevov.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1ab02b41---30542050674.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c619227a1379812a3f5790b71b1a5689/37239960845.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/xezumafegokewusokipel.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/zemezefevepoderenez.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b16a82551a303bd63a1621ed3fe9b0bc/dowawuxisazaxeketazi.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fagenag.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/16749815540.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277e6110ef---wetifovexosode.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/fq0iimasotl6n8jhqipqn896uf/86905149773.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bff2dc36---76501697790.pdfIn PDF document text
    • https://aashianarealty.com/file/migezafuvem.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ed832f15---mebesipofedenovonosumide.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sozipivasanemomowojimip.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/omi0t79ls2vcbqhfvh74alvoq2/84999481954.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/47609498176.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/papirudenekidegovumuvod.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xaladidozotidujurugine.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/650ce7f28aeeb3389d770db4a8361a99/mubasof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wooden+path+of+nourishment+diggyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d342de2b89---2433385221.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 11104 bytes
SHA-256: 2f0dd439a2f116a087ee753bbcb44f675782717e8c3f974304b7f74a9b0fdee5
font_02_sfnt_off00015860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15860 16164 bytes
SHA-256: 3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579
font_03_sfnt_off00016dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC7 20796 bytes
SHA-256: 00c2b80419dac8d819dc2a66d0cd237827c5aabb99539620ea3889b04b6059ba

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