Malicious PDF — malware analysis report

Static analysis result for SHA-256 102c8a0522751f3b…

MALICIOUS

PDF

86.9 KB Created: 2021-08-15 00:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c7852687bdb74a2e62db63dab06fce2 SHA-1: 4e5e754274ae85e773783abdeac9d0ff2d73c124 SHA-256: 102c8a0522751f3bf06b75e2fdc0abcf7772c760763a0470e720d6baa17f6e61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://annjulieskarpmo.com/userfiles/file/85898094000.pdf In PDF document text
    • http://caudafotografia.com/userfiles/files/57857802321.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rrrni2vr7nvt6uqjko9ktc0pnb/fuxanepejenaf.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a6a4c42d---wojuzaku.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/gaxawovaxobaxenazi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883818cd39---60961457882.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f7930a6e---solezul.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b055ef57dee---6059009372.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f556c1512c5b7b607afa4e873454ad11/xidufipiroza.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/86590715200.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/xemodebugopakenuzosupije.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/282221054c7cd34ebaed8ad80d0ae1bd/37341452486.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/neruja.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d490219ffcc0b9e6642155e6b9f502e9/dobame.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea36ca9fa7---1981167648.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e123f0c08a4---popig.pdfIn PDF document text
    • http://ipublicity.cz/data/file/29923408788.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/51067755283.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/webebal.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zomiwodojatakilutojovawe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k2ps20ais4tl6itebo1a55h0cd/dakiwujulezuti.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160706a8163bf0---54298289147.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/muwumuwexabefaje.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9b8728239---lususoz.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/wupoxebapepemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+install+foscam+fi8910w+without+cdPDF 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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16644 bytes
SHA-256: 3185dab2de95dfa8eb9c06a54f30a75c47b3123a2c18b5582ff14d52b66e5fb0
font_02_sfnt_off00013079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13079 11236 bytes
SHA-256: 9822b0a46b66f877c1e3ba8bad7b395782a40a9705e733b87fbebfd2f1dbb5b2