Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e380aebd79f6e8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 02:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad157438bc50f4c7afea87ab837db6ed SHA-1: a2825d68256ce54facbdd57b518944e717bdf3e5 SHA-256: 62e380aebd79f6e82e8b89d8b395a00ac3af253306509d6ca1a8ebd47f66d068
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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://domilot.com/uploader/files/nexuwowelabowani.pdf In PDF document text
    • http://ceramkgres.ru/userfiles/file/11799681557.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xuruga.pdfIn PDF document text
    • http://smirna.pl/files/file/zagipusunadokif.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613800245441a---pewit.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/77879562489.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/37288986859.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/ruvubupemekun.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/muxefo.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/42304857075.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/51056792448.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nunikiwuxezuwegadu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612f351a56ba4---potifasadagofugizexovez.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/dexadafejepevemol.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/60865918741.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • http://kdekdyjak.cz/data/xuvurosomo.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/vijuzomez.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0c73fa2b8ab9431611180fe9c4455e90/vutiserujejawusegemogurak.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/22177264748.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/mijelikikateserote.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oo51aaq5bp64q7vs231g1rnvg7/84404988786.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s8o113qh08ho2gf4ssj2l6chtj/31528884291.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/64700035535.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/84415948197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+used+to+go+here+filmPDF 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 17468 bytes
SHA-256: 0cf1ec89e98d8070d488a3733a43f7340a95f6e585c6163787ea12f5069abaaf
font_02_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 10588 bytes
SHA-256: b652a681d3f72fb579b0e5018f8c48f013dd872c8d245271a57c3bab1bdbf336