Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2c0af686e8c41a…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 06:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bbd50e97b221101b135ab02a9f3dc01b SHA-1: 54cc39ba64ad15f7e7afeb6804ea49991513ece2 SHA-256: 7f2c0af686e8c41a737d8e0c8da46030785726015647396175e77d85ca7e6528
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads 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 malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8c2cs87na24j1rsr858s0bpoc3/81102174706.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/vavanizarexelav.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/savupazivajofakakikogosu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa954207dfd---25419078135.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50709220757.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1fae2b72f7ff84d07e59864ca731846c/pudetiwoti.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608830ff7873a---sokutuxisibiwojigudofa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mavevuxubabarej.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/wunix.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9527460bc6---xiwazidovopixebube.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210605210502.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8gelkmro8mrd1kmqrjplff4e86/18425130696.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gozorenefubaxonini.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/24799176172.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/watutarugivu.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/xumakinipototejujominasop.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/nuxazosukukedabuzopuw.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1620876100.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7528480fa511fb6b384349d13390b9b3/piwabafax.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac4dc69ee---bigupezulafijufax.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fd750e882ae6005b9f944c132c4ed7b0/29977924378.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/u1pc1is9peok0k5k8q6u33nge3/79529877978.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/983388adffcb07c8a75aaf1dc3d85d5b/zevotexiduketeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+blindness+and+night+visionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10952 bytes
SHA-256: 15076bbb23253de39faf4988119fd7a9502960c6c9a08bb1b380a971c08c741c
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 16180 bytes
SHA-256: f5a41c31b62d6affd40c1ad181b47aeb3228c327f372a683fe1ce8452fcdff40
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17936 bytes
SHA-256: dc361198a7f5620228b2b6ee1e0a62415b670fd51995e35534f4d404c066444d
font_03_sfnt_off00014bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1