Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea892b70f7dbecf7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 13:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5eda737455b19bd4eb9dd9e74bc53fb SHA-1: 14638c5db6dcba5e96c3489a2a5cca999420b232 SHA-256: ea892b70f7dbecf7b9c97184b568e1b0f3055923f959943d1532a4c14db65077
154 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of external URIs further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=all+android+applications PDF link annotation
    • http://mcutech.net/files/32504932910.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/21147042571.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/70967303002.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81k5bcq88316dl6cm8d8jtvaj5/sowagopapepefotasegana.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lunupezegizi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/vuwugagajibu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/dusedigofidujesenefubosol.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/gekixejuvifatugiw.pdfIn PDF document text
    • https://biodez.lt/i/File/nikoraginaxukesefivako.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/kuzusijemebakifuliv.pdfIn PDF document text
    • http://iucecb.com/files/file/jozefajupuxogenibi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28c03778b8fe5089bc5e2d4267d0818e/50598783011.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xowarage.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/83523088110.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/mimabazinabobakef.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/51641529066.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138000b8085d---90287688243.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/51934387829.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/lofipisavuwirijukel.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bepifobikuzapisep.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/terar.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210909/16311900935520.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 10356 bytes
SHA-256: 90238b82893d867027c0b1acd07b584a676f94476b37550f13e848673f53ab13
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16844 bytes
SHA-256: b2a39d453a69ae18539970d8f94b1eff6d744303bfc75471b7b51d3c94d52e78

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