Malicious PDF — malware analysis report

Static analysis result for SHA-256 3888daea20e3096e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-17 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4442ffa4670614303319a668db45f7c SHA-1: 1ab7247d98b7f25906da2b6ef1d41f41adc6aee8 SHA-256: 3888daea20e3096e7c243436829953219122fa5b5acb744bb1591bfb616e724d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress upload directories and other disposable hosting sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://aartipalette.com/userfiles/file/varapudadopofumu.pdf In PDF document text
    • https://bushregenerators.com/userfiles/files/52545289720.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff954334---76199888347.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36b0b70a---wikosunutafuzutej.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/pogaperiweruwifugojos.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/55ca438f8bbfa67c7c2d812052c5322d/rufalazitamibikateki.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/68906862704.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/bizewejajuratunag.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc0c95767---vuzidofab.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d9f8808266958a1740461e1c28aa35ca/xetajex.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gorofenogu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/peloxojatu.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/32864321306.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce059b1bb---54628146745.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/somudojub.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/gewumabovevapepewuwi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb060007a0e---sitetevijenugupaju.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a83e6264---77924907808.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ece94488---pebalaxodo.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/zironekivataja.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qsbvct2mmvu3ar5muvuch4c7c0/wiwaguzadowup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fr+legends+livery+codes+chaserPDF 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_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 10708 bytes
SHA-256: 008757e4838d176ea01c68c9740e86f54d937ae974124972ae10c7b12fdd539d
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 21164 bytes
SHA-256: f7e212a9282da2a012f7074fc466c961301de4065242dd7ffa115a36db5c3984
font_02_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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