Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f8098e4405910…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 12:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ae1ae32de7a0b087db2ba9901aca101 SHA-1: 26142d99bee16b68d3fdc7d07043acf3363fe5a7 SHA-256: f93f8098e44059103da5938793a6d24097ea51e6b5b7cba70c5bcebc1eac3d44
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8de784b7---wodigu.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/420b7b2622c970319a50ca0e957579be/45571635847.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/35631672206.pdfIn PDF document text
    • https://nyig.com/files/file/22893591085.pdfIn PDF document text
    • http://riviera.az/userfiles/file/wogepifu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/mokinerosebitavigopep.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dpoln7amiqkau6ovh3jr35e613/65847103621.pdfIn PDF document text
    • http://bubb.cn/up_file/file/gojunuletolisu.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/panugupidavupibok.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/9969682473.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/meromanixibe.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/14149486202.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210920_8BEE1241E84970A4.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///gurukimobowesofukefobopo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/wejunawekuwumogosovogux.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e178a8e9ad---9927728904.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wobapinimawidabovulewozug.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/lebuxilidanuwobaraxijal.pdfIn PDF document text
    • http://koddous.com/userfiles/file/74977717929.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/9401317221.pdfIn PDF document text
    • http://hongdacable.com/d/files/24111508391.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/sizowukogusabiseduva.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fizegezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=heterocyclic+compounds+pdf+notesPDF 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_off0000b319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 16132 bytes
SHA-256: 38dca84b1fe5a72b8e46d00aed5221c8653ebf444df80d014d388f2d8c341b44
font_02_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 10824 bytes
SHA-256: e6794232f8f24066d9994d54c0b1625a85fb9c6ca7ec3e24aff28bd72e3e3d2c