Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7841917605e5098…

MALICIOUS

PDF

89.0 KB Created: 2021-09-05 11:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90b1fbd01bafc8c29d1a6dcf68553579 SHA-1: 428ceee4cc78251c4357986c46ac9c7bff47cde7 SHA-256: b7841917605e5098778fac985899b89054b18682d7faec5b4dea5391942374fd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to be directly executable but serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://metabolit.ru/files/file/xoleva.pdf In PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/11037515986.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/limafavufox.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/suzasaginijamunizanosejo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e84c0ed1---givejukurilotelajisurix.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866152b8861---70351740830.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d39da0f7f---5975128374.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0139ecc0---gatekezeduritelepakilajal.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/zarafagajonulop.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/lipeketa.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/vaxanajamereravatode.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/novivenixejeg.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e4a65cb8---norisufitixogebemuk.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/84c8dff32387813ad7dfe31f74efe501/13224898870.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a13afa74871---mewatunomezojifagasonos.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa9d30226---638530199.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210902_12927DC9055A4894.pdfIn PDF document text
    • https://efnnma.org/files/file/mepalewatikamibeliwulo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a124715dddded4ae7da641fa0daa9b97/62841600392.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342c473172---86848468836.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/69933585088.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b147ddbbc07---34467036942.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210630165310.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/barifasunum.pdfIn PDF document text
    • http://gotween.com/userfiles/file///gevuxasopazur.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pegujixajulozafapot.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/56d7eecf1bac47b781fa69f30107019f/33260046611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=math+worksheets+addition+3+digitsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 10824 bytes
SHA-256: ea092b20f7d86a896511799d28aded2909c804f7975c56e96937b1a9b9bbad14
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 17928 bytes
SHA-256: da8619080609deece3c6de7196b24d6bfaa2698ef8500e47716684608988f9e6
font_03_sfnt_off00013dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.