Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad07664bf93465…

MALICIOUS

PDF

101.9 KB Created: 2021-09-18 16:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fd89e794dc3c20dbef96c070ad2b60d SHA-1: 2751afa2a39a5e45258b0e1b54095ddb73c97bb3 SHA-256: 2cad07664bf934653092cc0bc7ed9aa2a1cbd4911a2835463dd0a9c850444088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdf In PDF document text
    • https://leanuslab.com/UserFiles/file/87858553573.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/99400726504.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de9a70b16---40626460377.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/13320881325.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/zopodubigikonu.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/rovipefebufofepuvogiben.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/92bb8eee07e48b42a1f22816b8480a76/sanurolobetovo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/52986668482.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/makalazuvupo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/fitilakiletujijan.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/91895032390.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gonotofemuguwemir.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/63569074409.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mepogafiveguva.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/lanezotupifalarido.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/2634437385.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ehbm1649fjcvg5ht6isp4dli23/38679286797.pdfIn PDF document text
    • http://landpas.pl/upload/file/54433591828.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/xurazelowapiwi.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/17781570408.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/75539361569.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/4259033596137d91d6c119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=magyar+nyelv+letoltese+telefonraPDF 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_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 10468 bytes
SHA-256: 3ed6520f4f847f4fb3a3c0a5c063769ac5a6e3f5e6e9dd7385db4f6c0a5000fa
font_02_sfnt_off00015642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15642 20104 bytes
SHA-256: 213e0e04d41645ff3ace1d207da1864651ac31f3030c00983ce3f6e71a38cd32

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