Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15b3dccc5c01403…

MALICIOUS

PDF

91.1 KB Created: 2021-09-23 15:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd2a8c0a26750b61b7009e2179774502 SHA-1: 453ad4d45adf065c2f4ac3803bcc41dd0e6f7468 SHA-256: a15b3dccc5c0140398efd6c7d6de286c95451e3ec0fa288e565686a085685481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, designed to redirect users to potentially malicious websites. Heuristics indicate the PDF is a link farm on disposable hosting and that it uses compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=full+scary+movies+2020 PDF link annotation
    • https://gea99.com/ckfinder/userfiles/files/41993992201.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/vasixek.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fafonadarivonalixavet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9579a73ea---tejokurot.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vekoxanaxamebagikalibab.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/redimifopopotodegelofiwit.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/sadopumereguzanisagar.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/talebelatitijisotut.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xikemi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/37001721072.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc78892706---bulibotuzikipagenodanumar.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/14028141886.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/dotepe.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/49215727694.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jegasabiborumufokok.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630636472.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/tobinutunofeminurone.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/sibuvubusijig.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109220728012000.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/14600574478.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144c46a0bc5f---84667905312.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d5d0f54e0eccfc8bb06645a37430e2ea/bidiwigajon.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/fogaguxuvupupetu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 17440 bytes
SHA-256: 52d5b795aa7963757f9f8e4aa288b78ade67069e6d480e5076069843f865d02d
font_01_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 10688 bytes
SHA-256: 7c537072c0fe9cb6f1b8532c823064dafc7737ee7c9f43144677abe40ee71d16

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