Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f37beef0e25119…

MALICIOUS

PDF

116.4 KB Created: 2021-07-31 05:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a523985478fe81038ecfb8ee84b1ec6a SHA-1: 10a51fc6ffef68430e44f33428be8bb1aa2e319e SHA-256: 68f37beef0e25119f19d73a96bbab204fe0c1f374581024326139f8064fea68f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=la+sombra+del+caudillo+analisis+literario PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d9ec989e---39381645916.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/99697473489.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/47067752121.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a2df397e0b472fb092db1a5136407e4d/gubamodawojuf.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/kigut.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/jekep.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6mn67f46r21lfe0gobmqdkkgp1/27024055418.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/xunezikezojed.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/gobefokizosofe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/ponapujiduduvemosera.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/aebc3e970713c61c021575ed703514af/lafiri.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/dadiwilojaxaveredosiloni.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb51228e56---ditimovapatodevajazotuwox.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/nokurimufut.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae53a4e4e---xinusekifuwetori.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/62814010077.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519d3b31b---12493389469.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b3596f4c5b74a7ea4f7e6e49dc245eee/28198252616.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/pukekakopexosusaniguv.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/19983848210.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vql4smm2igcbultkolhb4cqmk4/pufiwopilimeragub.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f7a666eeca24fdeb9895cfdb4b75b979/gumor.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jazawupimanurafevuwe.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/93322027763.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/turakoxezarinabaleturonu.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_off000161e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E2 10728 bytes
SHA-256: 9e5296364e945dff672a4e1e52d10e32d6c219f343e958376ad747dcf3addd79
font_01_sfnt_off00017a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7B 18380 bytes
SHA-256: 80c68c45a72cd8e636fcdf331a71f168d4a7f69263a1e2221e487ba91c686cc1
font_02_sfnt_off0001a968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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