Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b12c959cdf1826…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 05:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0dba8dad0812f13c461746f36ca0621 SHA-1: 1611fc663c9082bc6be89140e8b5babce69f535d SHA-256: f4b12c959cdf18268f499b8c26049e4fa12517c0358059a3dc913d15f6fcb784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host more PDF files. One of the initial URLs, https://pixomot.ru/uplcv?utm_term=abgram+auto+followers+apk, suggests a lure related to social media followers. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=abgram+auto+followers+apk PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73221703d---pojubuzapafoj.pdfIn PDF document text
    • http://status.cz/UserFiles/File/15231346688.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/41178545674.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/79877236443.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mui29vuikc0obo6ho2oh45ugs/46864278289.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fepadi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/1235007016.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/47849803524.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/25555080780.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149af22cd63c---xugabowubufo.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nadikesegaripaluvorir.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/85247254664.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/4631562353.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcbfb4501---54399372870.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/61814737183.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wefosadi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/90953799271.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tepegolekeji.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134227f3f3c1---pafal.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/47185752768.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/2550156574.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/muzixubobesujuzibowilulek.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d2c3b2d2c500ab668676f2d0c17b60a2/27270421334.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 10904 bytes
SHA-256: f292698176fd455dd86a4f6e1a98e022a5fac49ab5668dc87c4e1ada3e98dd73
font_01_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 17620 bytes
SHA-256: 113fae9674a71bd9276fca77aac4ed140b64170b8015c3a3bb90c42b49363f8c