Malicious PDF — malware analysis report

Static analysis result for SHA-256 7773ab4654c5b140…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 00:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65f4c711e7c2e431f28e0fbf66bdf706 SHA-1: 38572535b33d323e976c5160f9dc89870985ebcb SHA-256: 7773ab4654c5b140b3c7f07aee29957bd88333deb17b53dd3c27f19a9442294b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=video+box+apk PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e99771b6f---pumugijaneba.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/webopozexaw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613796b02b1ac---50658396687.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/70654123043.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mipomulezepotawujal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f50e9e4f7---63953548167.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614382fb138d5---wofesuxesudijuwumakaneven.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/29021567857.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fimosukifoxewasum.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/jililoridalakenanes.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912095650122597.pdfIn PDF document text
    • http://pnalog.ru/images/file/80999996663.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fixarevekizagevupoxa.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vutamolij.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a55cbe66b---68074928776.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/debumi.pdfIn PDF document text
    • https://raljob.com/userfiles/file/wixaxifax.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/goruginovozuvenajawimuzir.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/66057101664.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/kezeguwakewegiretif.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/xopejar.pdfIn PDF document text
    • http://www.520amis.com/upload/files/26193921403.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hq7nne6b03j0qvotk2rhaq4lbe/romepano.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/jilaxijoberorozojifomu.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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 10172 bytes
SHA-256: fdf00d0142b4ae6a71c4afdaf3742023668aa862b149aa740e813b6b8026ab49
font_01_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16680 bytes
SHA-256: 8bdb8f410fa427a3d206a740b850ba78dde49bfc019f021f8aa61be13a8e59e6
font_02_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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