Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4afa2a9561b7a2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 19:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0b7536f67246c03e87875af85be890a SHA-1: 275cff4bbd1bc2552903056b12d061c358d4e39e SHA-256: 1c4afa2a9561b7a29cbab181712a7703ec74ecce29d608eb67f88e970107304f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://pixomot.ru/uplcv?utm_term=lego+marvel+superheroes+download+apk+pc PDF link annotation
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/29338723891.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/waranano.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/pibitezipajesukigeludosos.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gefiritisorejozadexa.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/26463483639.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/43082928321.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/modogegujixamegaditotuv.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gilifemevalidamob.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db152c4ee---92959096109.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/67213126224.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/58880048985.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61700658052.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/83245703951.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/nopowabakitezoresew.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xapam.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb293b7e9---repajaker.pdfIn PDF document text
    • https://12shio2.com/contents/files/99767743354.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/dajotuxepujumosu.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/90320389525.pdfIn PDF document text
    • http://kaies.net/upfiles/file/fuxexototomi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/36241527902.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7b4e098d492a7f2be52ca6b7c3792998/56506548345.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 18768 bytes
SHA-256: 871a71edd4950064ab5642e817876bd31d75a5bc0256bbc36aa974e16257e2fd
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 11072 bytes
SHA-256: 9d10c1f9c37c4d444bb390551a75e59f46717f10158801229e9dcb5ab83c1a8e
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1