Malicious PDF — malware analysis report

Static analysis result for SHA-256 f231a91f7ab8163c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 00:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3fda0374420ec6500a4f5a2d1fac885 SHA-1: af00e938333b11f79802520a2871547b7fc2fa53 SHA-256: f231a91f7ab8163c56fdb59a3f0644fe2878e876bf6d7eeb7616258c055b4c5b
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

Heuristics 5

  • 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
  • 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://keluargamimpi.com/contents//files/11899032700.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3e99e9f1c93bbba79ae3816252881816/ruterebowotofilo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc32fcb9b5354604da489b5a37e17fce/13233451574.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/konurujixo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffee802c42---81770213641.pdfIn PDF document text
    • https://landbar.com/upload/files/25146200162.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/dujubiwak.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5a3148a0a50dbf20222c79c80df3258c/mifutemuxanixafadepen.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26c09ce143665065a189dc39a934c27a/61973927378.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/41375732565.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e20941bd---11301614399.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad9a005f2---39453982335.pdfIn PDF document text
    • http://erex.hu/upload/file/zodixebodatebovanomawa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/34a155a09edf66d3d5850c4cf0c77e94/vepijezeku.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wotodigi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d0c0253363b0f6d64f6a8d6475504f34/57394624887.pdfIn PDF document text
    • https://peterdegendt.be/file/duxedorokudidogominulala.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3d7830a30f824e2904b272d859d07526/sukugerununuzeku.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbb05130c---zafajimuruzujadojofibu.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/dotofegopefizeximexit.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ed0493645db45cccbab8ebf90487f94/dapavilafafel.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/refevi.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/008a7e65fc28918aafd4921740ceaf83/27287290331.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb538b29202---36648764290.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f393d9ad3b---91261469254.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/meab2v0nc64uhmo12viq7k3kg4/lakekikesoxikenezobas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sustainable+development+goals+pngPDF link annotation
    • 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_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 17504 bytes
SHA-256: 0b6dd9acf9a180be4d46c67053e3a8a1313093de9b940b3c0f6e1f7d3514d426
font_02_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 11016 bytes
SHA-256: 31a6ef3a4897c1c365bed9be925e6f0bed043754948d521858670ded4cd6e29a