Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebf4c9317f13b37…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 08:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e1d5c6377dd1de22102614f5c04dbb2 SHA-1: 8d34d516d5b5a31dc5883d1de83ff648f277d86d SHA-256: 9ebf4c9317f13b37ba025563ad378366b1e6996cc60096cf06f69861ab7915fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.gpaci.org.br/cms/ckfinder/userfiles/files/8633490186.pdf In PDF document text
    • https://dhesient.com/media/13974720120.pdfIn PDF document text
    • http://saimiri.name/upload/file/18138786914.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/84428617982.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4163af66b8c314e0157754ae9994e004/xuvijojezuxuvilugeg.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/83942573265.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/43699467855.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/golikix.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/16385195962.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/9282cb9ee2b32ffa114e29720ee40b3a/88559600044.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/pusasaralupax.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kugokajarato.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/nuxifug.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b75dc2086---fumilutizarewizi.pdfIn PDF document text
    • https://teamcode.net/upload/files/nebirusafozojivafi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef38d36f08---78055029336.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a2d0b846---kuxixajuvatadonanujijozam.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21371057008.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/29282501076.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nosalotejo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/26137144565.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c8d977448---gudilajanevafinajirora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=iphone+vs+android+userPDF 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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 10460 bytes
SHA-256: 96ac9e41e02066d7c9442b0ecf217f32d2ae4f83ae2577dc8035697e60514432
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 17200 bytes
SHA-256: 4c319d9a20edfa83f54e121e9d6263f426b34e89017881e2f81a802bbf4c1a67

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