Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8d453981b4c4d2…

MALICIOUS

PDF

93.0 KB Created: 2021-07-20 07:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3afa28a1ca435ddfb0d92e1c6933beb0 SHA-1: 406f6723d89db7bb5cf4e5ac298c08ff61cc7ee4 SHA-256: fa8d453981b4c4d25f46438d0b0151bf478fb31f2a8d02e1c8af26e63abe53bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, forming a link farm. These links likely serve as a lure to redirect users to phishing pages or download further malicious content. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to exploit users through indirect means, potentially involving embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/869uq0rscbs9ekai0d88kop145/lafesoxez.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93120c19c7597288b7a87acc12c26385/jemadepotus.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e558cbf974be18703617319d3a183959/ganiwewazoxulaluj.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/gesubuziwusalupafuzumuxuf.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/madeguwo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gemla3k2ktvt954a90uo11mrj2/nurimaruvinu.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/38100233825.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/77392810888.pdfIn PDF document text
    • https://isleo.com/i_photos/file/32288658716.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/60338848002.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7ef29120---webuwugepolil.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/dukaziluwopa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c806508351---bujifuxaziziwudifojo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vigiziwepevubalaxum.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16217150209605.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b6147cec3---12984877087.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ac269aed---pozotakapijemusuxutufiton.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7faedf23f---63638361908.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825d39c2273---3491556133.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/4c59dee6113bdb1558f0952a33dec06b/xejiworesipubewagisas.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d755901ea---83793994136.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/wogifijijuzazuge.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ce2d3ffbf74b1f5770cd690a08943411/bavesusajarafatapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=write+the+plural+form+of+the+given+wordsPDF 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_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 11188 bytes
SHA-256: 157521648b65a39aa85358cad928641aabf01d8282ce7660258742621cac44b4
font_01_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 16716 bytes
SHA-256: 96197df64a31b23bd4099d5744c36102a6c489d7591e5b97e7fba8bc9ad9e388

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