Malicious PDF — malware analysis report

Static analysis result for SHA-256 08243a3c4ae2361a…

MALICIOUS

PDF

82.0 KB Created: 2021-08-10 06:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da36f3bc0e9e8c8dfcb06ec119369365 SHA-1: 5f5f48b13e158b7c6ee071c7d0bf9896121bdec2 SHA-256: 08243a3c4ae2361a2353d03398e013df96e8fbd137561a4a742f4ba0538a846d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a strong attempt to direct users to malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of the file, suggesting it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdf In PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/botilule.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86da78c530---tarobemurusepelidot.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/sewixeberuvobizugixisejep.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/lalepelasidepopititajas.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/90d5d46990579b2826c90cf35af5fdc4/tivetisomutinejisawesiw.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wilon.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///6937178795.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b9ce6a52e4fa27dfd43f2f98e40a411f/67096653337.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/21459329020.pdfIn PDF document text
    • http://standardamulet.com/files/files/dubegeteloxig.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lunironavuz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5aea29c0331d725478e2fd45e0a958d8/55697220536.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6e718698634781fd865f9230162ad5ee/pazujalosobajekefupowiro.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/91v718tfp7cf0vak66qm5maq76/55299505074.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/nigamelosisawiradorazis.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/75053761166.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/bf43816e36a775acea62ff0312d30548/23764407041.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g27j4bpjn54vnu4m5r34nmveb3/45330406868.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/39415284984ef6f210e5034b3fa86981/57937788302.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe30be096---17607547308.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/95952557362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dictado+sexto+de+primaria+b+y+vPDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10948 bytes
SHA-256: c1d1e66c48d1e1d7d29e02ddb7982fec431ae6da7ad6267818f2784295710fa1
font_02_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 18140 bytes
SHA-256: 558a353697b1e6bb67fdea1657c40bd0fc809b6f4e6a78cce8b45b778dbf8a63

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