Malicious PDF — malware analysis report

Static analysis result for SHA-256 922ffdf40c17cdc0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db31871452fca73e31d668d96c037fe9 SHA-1: f8d4a87b063ee2d6e9de13e75050b8ca2aa94d40 SHA-256: 922ffdf40c17cdc05d45adffe444f98462ca148544e33221b2a5ad0ff3704d32
196 Risk Score

Malware Insights

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

The PDF file contains multiple links, some pointing to compromised websites and others to domains that appear to be used for hosting malicious files. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent is to trick the user into installing a browser extension or update. This is a common social engineering tactic to deliver malware or steal credentials. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=shimeji+browser+extension+apk PDF link annotation
    • http://bulongvungtau.com/media/ftp/file/88988306110.pdfIn PDF document text
    • https://advik.net/userfiles/file/80255705679.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/51239737649.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/94429776465.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/92542451343.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/ruxufuwofimitugo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/kewegage.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/luzebadugu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090821515973499.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/2026043158.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/28006145168.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/28pd28vo1pdae6nssa7oirons2/popige.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/zejubetubitusevu.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/ledazuzasozi.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/1980106030.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fe131f122db9d007baab88ffde2a8222/gafagubak.pdfIn PDF document text
    • http://effektfilm.de/files/file/14621688289.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26085254068.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/87484616663.pdfIn PDF document text
    • http://travellerisland.com/files/jisekumutagamosofosuna.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a030c352a3---kinawitexewisevarujagoxe.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/bedidifipakekekasa.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17500 bytes
SHA-256: 4e35b10ca1d8cc9b1d54dbe5abf5627f1a51dbe19be2dc8dda85e9bf32db7b7f
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 11096 bytes
SHA-256: 5ed1d8c9938b64b2078d176dd130a3bb5f066cd4ad82050c94979ec61974327f
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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