Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48c0b16b23de4f0…

MALICIOUS

PDF

97.1 KB Created: 2021-07-18 07:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d28cc1fc8390e15fabf1ccbdc23741ff SHA-1: 2f3c8f252c8b656ec8341cc661ff5b9b7d488919 SHA-256: a48c0b16b23de4f0b29ca32a883a6cd8d18f0dfda54119547d9d64a5dd9f556a
124 Risk Score

Malware Insights

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

The PDF was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to domains that appear to be compromised CMS uploads or disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a lure to redirect users to malicious sites. The presence of external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.1724

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://photou.cc//ckfinder/userfiles/files/35542796891.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/923fba9dde310fd2f991411e6fffbd6e/besuvaxurakoravepekaf.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976cbb1a079---77029476082.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/rovep.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/finomivaxoretonatinemile.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/685d6af1ae7ed0a38485e318c4c6222c/runitinusezawes.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/vidajebebomatiwuwufen.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebe4b05de---40257566895.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xorikamivubu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r4etna67l588loqsiesmej5gd4/78921763631.pdfIn PDF document text
    • http://artospace.com/pics/file/fajugenevu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/44957054005.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074584eab97e---vapafeb.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4dd7f3232371a85fa6db5a1e531f6fcd/pagojapepamokebif.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/6509113856.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b063dac161b---zenawisevubo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3ec8412d8733ff8fb51409622bbbf796/xowew.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/nikewexu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd664d52c---80837256921.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/dekomejanipekuko.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/vugalorerorumovogegol.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/budoterijiloluvuruni.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tezepegesoruzonajaw.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/ptg9ekao0s9v01kk6lrplgv70q/kixuxukaturoratixotezog.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6nekt1a31palidmqfkn5oeveq5/16976872362.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a88cd483---78524101184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=all+that+is+solid+melts+into+air+marxPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 17276 bytes
SHA-256: 11aadee61c11ac3302d61f9f192be35dea8a4bd37aa8ca3c76585e13a1885143
font_01_sfnt_off00016835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16835 10596 bytes
SHA-256: 610416a24794cbfa4c9046ba769e5a325078158b22e0658ba427c45e89b18628