Malicious PDF — malware analysis report

Static analysis result for SHA-256 027f43ea230826cf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 489b8723d1b8eb18f7bd0b0375a429d4 SHA-1: a7f8e78cca1926f9bbe05ff5456633dd232a625b SHA-256: 027f43ea230826cf38671216b20ee17a400687397175c44839a8abac4fd37059
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document may be instructing users to open a password-protected file, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/2j4ne35jor95dhf5fkkqsqrc94/lujog.pdf In PDF document text
    • http://staresecurity.com/userfiles/file/wolofekowowavametezegigi.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/95096559347.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_663105149243AEFF.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xofuvopevuri.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/42419326432.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/75425057103.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/46129257041.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/negumat.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac79923d88---givejagiteja.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/42212430987.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/21039957045.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/38504573911.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/sukawotapomutuda.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gedaxezanutozaped.pdfIn PDF document text
    • https://motoralbini.it/files/file/nilibosanotifomagejasemo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/sabomidiv.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc678f031---niwijopisemamo.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/58667809943.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/vutanuxepufakujuj.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fevadenojamejafobo.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/3507942056134ed8dc14d4.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/72015065663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+unzip+files+on+androidPDF 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10628 bytes
SHA-256: 88b88d507f8df3afb9ff8cd1bf803893274551b55b2c4f3a4ccf3eac0dca88d4
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 17740 bytes
SHA-256: fe1c0d57f3cf8fb5bf5c736d1097869f9e14c3a37d03b567a2acd356c02a4fcd

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