Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f47593d02ff72b6…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 19:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d387422ed84a5d4b6a6a5a8bcd6a9dbd SHA-1: 20a71d520fce1b081c8c965c332380bc4f51600f SHA-256: 5f47593d02ff72b6bbffcbdd0e277867b785aba14835ffb63e247ddf285ec2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://pistant.ru/uplcv?utm_term=overheats+online+pdf+4sh PDF link annotation
    • https://cuatudongsaigon.vn/uploads/files/jetubarutorubav.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/lutuxulo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63ac20ab65---47400999171.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/maukmucbhnsitbm22n6jrt78in/zebaso.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca33012f7---18400672044.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/galonesovu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c281267fe528f4fc7df00510363e83d1/lezebixinujep.pdfIn PDF document text
    • http://www.heksan.com.pl/file/luwifexeza.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/wowivizawosagul.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/89050517449.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7f435f2c---koxikusawov.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/tijaburofuvizalab.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/653eeca0aeb9ad34ebaad249384e036b/davutulep.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43539681497.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/52188612978.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6176332ff---17052267318.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/58297559905.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/konve7ov2k2k3be3kh1k4fat15/bogurilubogopobelagere.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/davamisowiladukexejonu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/74603703056.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/dibejis.pdfIn PDF document text
    • https://stopserv.ru/files/file/ruwenatujekosuja.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dd5996d9c59b88450451304d5fc76a37/sibuzepixukodadixowupa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 25072 bytes
SHA-256: 81c140e1446de7a8c9084007512f5f306d6130d7e3a459876564ef546b39825c
font_01_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16456 bytes
SHA-256: 0517b1a3604e6d183654e1f4c4885cebfeee4ae2b1caa800686a08b33e2bc8cb
font_02_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 10764 bytes
SHA-256: 82dd98f63d5219d0e7a9f18d1f6953042194f84004f4d56586379c4d92435226
font_03_sfnt_off00015282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15282 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00015a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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