Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c4837f17c8a93…

MALICIOUS

PDF

83.7 KB Created: 2021-08-20 00:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ecaef6d82bb2c50a829c5b95bb3b78c SHA-1: 0e384045627cf05a68d452a487477ac0e5bdf2bd SHA-256: d28c4837f17c8a938d5095ece85cdd4e611a6d8cf460cba72298704a9d7fae5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics suggests an attempt to leverage SEO or distribute malicious content through a network of linked pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/duwagesasikul.pdf In PDF document text
    • https://wittnebel.dk/file/jesijefonuzizikon.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fdc872eada9b40e0b26cc1f0c82d66a0/falilekijutedakufo.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vewujeparupob.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/juzopeberolopolojojaba.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160806c4abf83a---59504139911.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/83372729681.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8150b7aa1d09d1fe99e4952787d17794/pebijeb.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077250630ab6---jixirozir.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/13770903979.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/853203a96f251a9f96ba53e16dcca3cf/97396713373.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/95435045201.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/94438493326.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/4990749741.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/88111291188.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/82952498454.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a7941e607bf3901695ff99f7843fee1e/25532674106.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/433af6770b426d0e73364685484013c1/49049468938.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/94421ab3a76c46fa9dcd0725937e21cc/rejawenidumamirezati.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/buzulebidozen.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/newelo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tgn3r0fbd7m818lpjrpab9bk1/tubuxapupamutur.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb83a867---17085738550.pdfIn PDF document text
    • http://shosholoza.de/file/bafiwil.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59e51070b2996315e31870a619a2cb9a/5485645993.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xinexedipobumasaxaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+cdc%27s+definition+of+aidsPDF 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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 16204 bytes
SHA-256: ec6d56e5e231a86dcc33c888b30f0b4ec7a4df47564e8a1f160be619235c6745
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10452 bytes
SHA-256: 570f2b0de2eb6d92e509eb0ff7f31706d7f874301b033d0b6c56520454238ffa
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1