Malicious PDF — malware analysis report

Static analysis result for SHA-256 9848e52dfb14c876…

MALICIOUS

PDF

69.3 KB Created: 2021-09-11 01:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fc2c6bac751b430322e874f44bbfee2 SHA-1: f76c4c4049ccf8f87cabaee846458707b9148d50 SHA-256: 9848e52dfb14c87628b6e59b51be03983f474b52047a33eb313e88aac749873c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic for delivering malicious content. The heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. ClamAV and ML classifiers confirm its malicious nature, likely as a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bedandbreakfastchia.it/userfiles/file/lizifalomajuwidaxifaze.pdf In PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/pozebijexexezogix.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pnebe325q4cpq3agnof5ebju7o/nofugidewuwafaluvosum.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/83999141525.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xogemesex.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/14334487041.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xisilusapi.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52435103361.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/82707309518.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/22424299071.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210911051820.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/sorutobevudukazujitajok.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/64785675723.pdfIn PDF document text
    • http://licausi.it/userfiles/files/64245986038.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vidafativ.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/57c5e2a967e4afe625370eafd2c48deb/bemegolovemumanolafiwojer.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137910b14ea4---6661401627.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/98727697229.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/85946401599.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7946c14b5064e6e696edcc5dc47a6810/wopowuximopoma.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/dolofegabexujamogumab.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/87183687211.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd352860be---85868506189.pdfIn PDF document text
    • http://olympusflights.com/files/files/97366025424.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sidamugilelebovimolekabul.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/pabunasigeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=app+hide+lockPDF 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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 10052 bytes
SHA-256: 523ce1323ac8f961b9c31241fded92855492b3207962941caf95b471f3a9bbab
font_01_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 14304 bytes
SHA-256: 3ae952afaab7e14c92300422eed3d9b5546500d099843ecfed386c27d6c9cab4

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