Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e99bb08579b73e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 00:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2b53eebee68a0e63321d03bb0e8cddf SHA-1: cdfbc768ad5087b4adf51314aaddcd3cfbc91a81 SHA-256: b7e99bb08579b73e4ccd79a28363cdd9e055157d7326eedbcbe8aea79c0f866a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=aot+2+final+battle+apk PDF link annotation
    • https://siangyun.com/upfiles/editor/files/98259845102.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135078b2983c---kajofofenenako.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c54bc02c8418ca967d8e95affec7ea5a/temidijeremolawalupu.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/vamudoxovimibogatedak.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/28898274099.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/telulefupikaxasipagefo.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/xifolemuzowaji.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/temovarujifuvidebafusuba.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a794f0cdcc17b391a096037211a2be3a/47155599219.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/12275984479.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/xinalirominivenu.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kakepililovoxurumokununa.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/mamezomevedel.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hjh37nnhd7b3vngc9apmhrqdq2/66141631137.pdfIn PDF document text
    • http://odumakus.com/uploads/files/11881224530.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dowetixelupotunawi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dafe1214b---pokonaxusixulolugepawoki.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/kosewobez.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wusenikikukuxigoje.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/84807341503.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/56160233728.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/nesujesetepes.pdfIn PDF document text
    • http://minerva-collection.net/files/files/farejuwimamo.pdfIn PDF document text
    • http://cutskytools.com/d/files/kukanix.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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 17696 bytes
SHA-256: bf0de7324ace0a29e9e7ec5d524975d748689497f3a2bcb774639ff75c13272d
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 10416 bytes
SHA-256: 93d5625d310add904ff18bd82db1ed67b03a18674f5f5eb3924b2df028cd4208

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