Malicious PDF — malware analysis report

Static analysis result for SHA-256 f366331f7c65cdc6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b088c3eff7914bc8aa7177ae1bfe8280 SHA-1: 098bc572d757e89e2eb601582f17112e67db4d55 SHA-256: f366331f7c65cdc677663c94163982f736f75446e5849b32775d717d277cd435
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The heuristic findings confirm the presence of a link farm and a potential CMS upload compromise, suggesting the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=2d+office+floor+plan PDF link annotation
    • http://dkstores.gr/userfiles/file/xaselivobofexinaratowoliz.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/dijowogobal.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dukozobelivutek.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/xarigalipaxakatiruvek.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/veniwefarafofudoveluder.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/nepureponutagugojipifope.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinefuvepasunuwizulu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/21202839601.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1a01hi389ge05323bqafmj176s/27797306019.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/36454766382.pdfIn PDF document text
    • https://n-tlg.com/files/file/gasurodusidematidukonon.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/30706476561.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/69014828525.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/limaberabu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5d435ca6221c4167acf80fc3920dccf9/wonizuvobuvabolurenidedug.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398419cca01---jelogakosuniral.pdfIn PDF document text
    • http://seamacros.com/upload/file/musazikozo.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/kuwuzozose.pdfIn PDF document text
    • http://kes.org/upload/editor/files/57041966110.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/96880802701.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109140355455837.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/wexovininipekixeduva.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210919_2AEC9250BBE04B55.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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 17664 bytes
SHA-256: 130bb304a85f80f8592cb7b091795cb8f36296e6a8aa905c2c07a5a8a5a444e6
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10372 bytes
SHA-256: 6ff4ad9cb8ae07bfb76d867629964ffc4ffb57f61f59f632ded2e9c96bb596db

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