Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1630541a1f72bcb…

MALICIOUS

PDF

112.6 KB Created: 2021-07-03 02:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d5d211b8fc541a9101e5c12a1c76ce2 SHA-1: 895e937d2a899e02176ac00b5e715a56441038e4 SHA-256: b1630541a1f72bcb34b0fc829b139eb9683fe3bf5f1fe0b9418524b962eded7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://nomylo.ru/uplcv?utm_term=the+first+night+with+the+duke+novel PDF link annotation
    • https://mk-sito.it/uploads/file/60373573782.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609470a9d93e6---wilativojomagituwajaxisip.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6b214a26---36677535170.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/48548013132.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160791678d06c2---moxesiga.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd6c75588---sabinexanudevozolinixaj.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/682qqvsel9sajoee5f55sa3dvt/29545560595.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca67f541d492d0e2a9031de092504393/48303541863.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fukat.pdfIn PDF document text
    • http://armanetti.com/images/72232553166.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2429524ffa57b28cef0ebd6baa1b12fe/58369495578.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3b6e4ddc47ed8feac87904b9e14ef0e6/23741604703.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3838718b7e---82427288072.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cba4a7494202edbfc58df90f2671b034/53744704392.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mjdnb0sj38rvugj0goab5nni57/11938576201.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/412d649e28c6ffb163cc5ddab3b00bd1/86857678015.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0b295fa414e2e7f0a871f2a191f0a817/rexisepulosefadiko.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0e7ea86be5fe60832be2d41dc1da28b6/juropijodedefokedaf.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d62h0uvtu831jlcgllvsc76060/texelolurodulokanivura.pdfIn PDF document text
    • http://mp-journal.com/media/file/siduwulon.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/16964514249.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/65802827934.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gatikaxofomolipokeli.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d87d9824afd---77520430021.pdfIn PDF document text
    • http://skomi.ru/img/files/file/37084178937.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208a509377---zuwiju.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 10776 bytes
SHA-256: 5668e50e88fd6ca479d043957e6c6f996cab0ef859466e083372182850a917ef
font_01_sfnt_off000154bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BC 6268 bytes
SHA-256: 5c3e010bc46e3a24996254883336a5bbbedbde765de58d78640fef99f81c0d21
font_02_sfnt_off00016b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4A 17580 bytes
SHA-256: 7f6999e6136559ac70d46860945069ad83099ce2c9df736865f4b662f786765d
font_03_sfnt_off00019948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1