Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ac90fd2d2ee081…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 01:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9491e17ca2a6e049c13780b057262a8 SHA-1: b06b4e5d7a8efda4a9bc7a7f90bdcf27fae737cc SHA-256: 94ac90fd2d2ee08151a241f405affe4eb5becbe8a4e258d842b835ba2c8b9057
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs, many with 'utm_term' parameters suggesting tracking, points towards an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=meilleur+site+pour+telecharger+jeux+android PDF link annotation
    • http://adirondackseafood.com/ckfinder/userfiles/files/fogaginomuvaxexifego.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/13497543326.pdfIn PDF document text
    • http://calisnt.com/uploads/files/58926727654.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/66554462828.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/63537124688.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/vilirezalinisisut.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/47801180618.pdfIn PDF document text
    • http://ccshecea.org/upload/files/1479460052.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109041031036106.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/18017209477.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/xivomak.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e605e2c32---44770161868.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7hacra4q43qgrlp838drh30mm6/fedojojatiwijareza.pdfIn PDF document text
    • http://skisun.it/userfiles/files/wirizudifesonoxezawa.pdfIn PDF document text
    • http://waypl.pl/upload/File/jewiwela.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c52761cb---jejipijozuvon.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/28686028140.pdfIn PDF document text
    • http://cosyromania.com/media/file/fupazivikepevodu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/37189523863.pdfIn PDF document text
    • http://compsult.net/userfiles/file/72477317500.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/97932617410.pdfIn PDF document text
    • http://teresachild.com/upload/files/40997590959.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613897ec270cb---fomapijolexopavetixenon.pdfIn PDF document text
    • http://cobmedia.hu/include/pabutiralanudepox.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/xujefatazixilavunosuza.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/11061767453.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 11120 bytes
SHA-256: 9ce6261c02e99d2044cafbc034fa3bc77b47a9b24eb576bb7480418ad10630b1
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 18460 bytes
SHA-256: b90b4f69c652a70cef54749b35a525328b21004a3da0e21bd3007eed59e8e175
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1