Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfacae1cb815202d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 23:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb3a43bfd6721990951e7e590c36b04c SHA-1: eaceb09f04ba295c850606d855518204318ff506 SHA-256: dfacae1cb815202dbb749dbb05577d7cf433907f6a229ff53d3d6f7f7346deda
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely attempts to redirect the user to these malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=guardians+of+the+galaxy+full+movie+free PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/jivito.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/50525733359.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/pubusubesunilatug.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/26303096520.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac6aaabb39dce2dafe004f055efea548/kupirotadebatax.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/29828880827.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b7b5885b---fexusazunovi.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/91639073343.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/14376233548.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/bewemolutetopoga.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913000313.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/43495810599.pdfIn PDF document text
    • https://akemi.ro/hirek/file/36402108827.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/wozeroxejowep.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc2fdf6fb---tixulipukupegaxomunadat.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/67061778887.pdfIn PDF document text
    • https://palet-school.com/files/files/romazevetofu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/disejaleropebomota.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/26364070207.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kogebajebotiwagota.pdfIn PDF document text
    • http://splogservice.ru/content/files/kaxaj.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/wisesajugomiban.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219151844543845.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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 18072 bytes
SHA-256: 3e266a44ac8e6499dbe8bfaad7c6b416596349d10a86daec94f5bf5e6da3cf79
font_02_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 11220 bytes
SHA-256: bcdd777394d21b9ba245f79c444cc309a0346b1d0771d612113f1b0776f337db

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