Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff0804e3ee9451…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 08:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 048c2cbae0c4e670b6f6f697e9025cff SHA-1: 13b6e7cfb0c4c8396251f644bd9a1809b1df963b SHA-256: fbff0804e3ee94510a433015c20d12b5cbc59d4710aa7fafcf4cb7e4cddd57be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing content or distribute malware. The embedded JavaScript suggests an attempt to execute malicious code, potentially to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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://aotwresort.org/ckfinder/userfiles/files/rixaxowivoli.pdf In PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/96812280932.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/71670142875.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/wepawovomonag.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904211556.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/geluxase.pdfIn PDF document text
    • http://uhorder.com/upload/files/15280802390.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/30611375714.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/kagibejaginoxiritaturuwu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/rixakinepoz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rk7m0m1vtd4hp2vn8m5mmsied9/47309288649.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905090343.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/subenatepewuw.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/kixabed.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/dofurevuw.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zixoz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de57eaa5---88502575866.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/tagifixo.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/39593864380.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/tefogibezotadutonite.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/63023991045.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/8059302537.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109061712316117.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613211ff70260---46368917550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+football+online+free+streamPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 10732 bytes
SHA-256: 29a6e6b6ed06ff5bcefc6943fcbd4f30bf156c04a6685676911d814a3aa07a9a
font_02_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 17520 bytes
SHA-256: e090e4adb57ad1638e55ade153aef31a12eb2324ee664e2570c42fea08842d1c

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