Malicious PDF — malware analysis report

Static analysis result for SHA-256 e853e6f7bc0ebfa7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 10:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91b127669b5b83f960be4d789c8ab759 SHA-1: 5b034c77f6623a76147e8cb146f7894be3bad48b SHA-256: e853e6f7bc0ebfa7051c6f0596a40e9274fce97bba74f1fc6c8ae295be7facc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://faresaldabbous.com/uploads/file/20132869948.pdf In PDF document text
    • https://posetili.ru/userfiles/file/pugisasarovepolir.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/jodidisa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfb7bf027f996ef559b7c93bebe5dfe9/72318176025.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/badupezowepejovesan.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/317c11b4de4ae3fee0eaf85d6f38c7d5/bafosil.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rarujewevural.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/45609873488.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/junafetunumuful.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/mokisam.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xefopato.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/tofusaduxam.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/72775950086.pdfIn PDF document text
    • http://robbes.nl/media/files/fufejalana.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/99521734575.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/ruzagijegaxekowawipibaj.pdfIn PDF document text
    • https://people11people.com/uploads/File/golofarepekiwujaje.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/43422263335.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/bomivaji.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d7e8e7dc---42352819461.pdfIn PDF document text
    • https://scalping.ir/data/files/file/lofamawelunetefak.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/robosuwozi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632095789963603112.pdfIn PDF document text
    • http://computerdoki.hu/user/file/96366083364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=john+wick+3+online+free+streamPDF 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10940 bytes
SHA-256: c478d63ae8fe87238e4a63da000166e8c3941deb52bf52369f4950af86e41a57
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 17344 bytes
SHA-256: 162675e52eae64032d1ed5ffc40993674a115cafb4da054b5ffbd5ed9e927d90
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1