Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2872dd555f8834d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 17:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81d902b030b9c14204c13ffee36206a4 SHA-1: 7fe269b1064f19b9286363d7b44d967dffc70092 SHA-256: f2872dd555f8834d39a832a981eb9fe7d348b3a4a7e9928f680ab2efd38b202d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=pangu+frp+apk+download PDF link annotation
    • http://networkinglikepro.com/ckfinder/userfiles/files/8734426286.pdfIn PDF document text
    • https://penal-garazh.ru/files/rekat.pdfIn PDF document text
    • http://viettruss.com/upload/file/jifosinalin.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/kenidotikemilep.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vniog19evbc6qtme8l37b2f4q4/bibalalaxazifaxu.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zatizawivutopawirujesi.pdfIn PDF document text
    • https://limsurdua.com/contents/files/vupipapav.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23126033699.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nefuwavopuketepikuzu.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pefawokitaxifewe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613427318fc41---defisatujawulu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42408376363.pdfIn PDF document text
    • https://invest.pl/userfiles/file/vudewagedip.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/57730901175.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nalafoxorijimikuf.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lenelabadadixajakusi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614779245458c---70934747772.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131642041cf1---19347102316.pdfIn PDF document text
    • http://a899.net/userfiles/file/88045264953.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/4848568877.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zagifutofelorer.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210925181353_1378937398.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/fuluxazugakemufokujuwo.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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 10460 bytes
SHA-256: e29f1819325e9cf1c70cf61a70e7317e8edb423c40c401d333c6f1f286c490b2
font_02_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 19232 bytes
SHA-256: d6fa02f089e5cd845c2638378aef73b4f55e71d94fe549c2386a29be768ebd60

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