Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2eefe388e3a03a8…

MALICIOUS

PDF

92.1 KB Created: 2021-07-28 09:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdd570e70490ce5618ca71dd08e81385 SHA-1: e4cb6a217b780d2068bd333534b35d4f00c2fef8 SHA-256: f2eefe388e3a03a86fccbd2fc7e42f674718654538b8471212165fcd884c172b
164 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. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, aligning with a common attack pattern for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075eab9928f0---25723992245.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/13654284700.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/sulatokuto.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc6b6da6---38731115582.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/10598288704.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/841a8e345de1ff7ac1697cd2c01fe9b2/luxenawarevolasidir.pdfIn PDF document text
    • http://vina2002.com/uploads/files/rikaketus.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fcb5d37d---28947852722.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160790fa78d118---88193122964.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa1fa8fa6---75551627758.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f20b82240---giwirufuxorozariwala.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a3178c955b02b7fce0de57ecbdcc17c/50026240131.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/piluded.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ff14aa7683c30f484a4f8449344bf858/mifezu.pdfIn PDF document text
    • http://bakoca.hu/files/file/jolutesajamavatosavonaxel.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608899e6de9e3---7301235324.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/38732821697.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/11322494804.pdfIn PDF document text
    • https://ocw.tw/uploads/files/23873949394.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/bomezige.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/691608207.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e313a8402f6cad569b399dca89fad9c/56043761824.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/lifugewekeperudise.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uf3l453fuobn0pc5rkfdbcru19/65164743461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cumulative+frequency+graph+ogivePDF 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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 11216 bytes
SHA-256: d5d14038c0b484e06823c25b42332d1b623427ae1b3cb5e1e64e142ee723442f
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 18388 bytes
SHA-256: 1bfe78830aa2802b2b975a7835737ceeb902a43017a5f13d081aa406c35b5712

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