Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e7cf4bbabdd89a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 04:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55fc1c956b4f30ed9791e6021bd0c6cb SHA-1: aee5a53880d4391b552d9067a6be1257c17f8aa7 SHA-256: 67e7cf4bbabdd89a38a7c1e72b4ec7620789eee00601633130e86e62d8db8448
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obfuscate the true destination or track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=salt+by+nayyirah+waheed+pdf PDF link annotation
    • https://maychieuvinh.vn/upload/files/jowuludefatukilum.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161328028d9748---jitawirofusosurowafaloxi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/77861011091.pdfIn PDF document text
    • http://cecev.com/stockages/files/somidu.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/fumadamuvo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f5efc4a3ae1494f851fce410b5bc1739/65948732502.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/88351252669.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/21333951628.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jewuwogegavetibiwukejefa.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/18797129758.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631238536.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/verigasufugin.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/15415571992.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/62318825567.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a62c53315b81ddf8ceb1e037705571f6/43044781024.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g3tvovci22lknrq8lnj5tmgpag/78677286313.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/78055767174.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/jubatimulelodobuk.pdfIn PDF document text
    • http://kunbot.com/upload/files/590437713.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jezixuxulavanixivizabar.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eb9bd151d59d2009ed10446e5b17f281/koxudedumer.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/fimumovutokedujoxigeta.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59773578916.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wojovoguzidagese.pdfIn PDF document text
    • 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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10720 bytes
SHA-256: c477205762cdde65cfb4c87c718b8e542a79d48f71475f85b77de5129687fca4
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 19276 bytes
SHA-256: c590d4dbcbc0f35117d46a6fd02a70b36fdcdb4d2bf7bf1de4a8e2ad424d4b82