Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a81d05ed575a47d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-11 18:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a445b10ac56d511ae0054512c989bd3b SHA-1: 04cde79bbf51887f92289faeaef4f6e2d9ad1913 SHA-256: 6a81d05ed575a47d465485fa2cfc86a696ddf9ddcd749f8c87bd8414a830ebfd
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external domains, many of which are identified as disposable hosting or compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://moto-trend.cz/public/files/fck/file/sejov.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773c28e99ee---25604792184.pdf
    • https://bloomland.com/sites/bloomland.com/files/porogatejadowabixakutobim.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/lonulinibixijiredirubeda.pdf
    • http://www.findvoters.com/userfiles/file/8246164339.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/gagixozolojiturumejik.pdf
    • http://ylgems.com/file_media/file_image/file/31870985198.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8uo1tn198oilffnihjcv1hu0kl/kulosexogasifevabek.pdf
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/697775359.pdf
    • https://schmitz.cz/res/file/mupagunewufetuwanodoge.pdf
    • http://kanizsakran.hu/userfiles/file/viwamigezukeduruweneku.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/rutalewe.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb556b8e1---nazopi.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f22055a14b3336b5133825feda9a0cbd/32345909021.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/pogarakusawelaf.pdf
    • http://jyjjapan.jp/files/ckeditor/files/43936792407.pdf
    • http://xn--80aawifdlfr.xn--p1ai/ckfinder/userfiles/files/35627175062.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/silogemowetupageruxakaj.pdf
    • http://nemdanangpho.com/uploads/2021-06-15/images/files/34456418275.pdf
    • http://vyveva.eu/UserFiles/File/14518568552.pdf
    • http://rld-carbon.ru/file/kotebadizazefomunuwomezop.pdf
    • http://lotusburbank.com/uploads/files/ganipezolibebe.pdf
    • https://casabresciani.it/uploads/file/xujij.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5d100800---xupepezev.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904e2488446---kizezoweruwora.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+convert+a+mhtml+file+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin
a625092deffdcf0c84163ed744d05390f5de5aa6707298a6851d2dd51d714506
pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10860 bytes
font_01_sfnt_off00010b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
font_02_sfnt_off00012324.bin
21eb93828fd0c2031fabe238a1af2327cc0a260950156a049caeee5a11ba5d08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 17292 bytes