Malicious PDF — malware analysis report

Static analysis result for SHA-256 999bc356bd4c1f99…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 06:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c09372fa97b62ed8fb91ff9193ab1b5 SHA-1: a00a171768e33b77305dccb9142ab5a36220c452 SHA-256: 999bc356bd4c1f9986f0ccfeff4ca9c2c8db10d56200bfd0a9bf439811fa4694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=firestick+tv+vs+firestick+lite PDF link annotation
    • http://gizmakina.com/depo/sayfaresim/file/53004942712.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6af2b4b78c871c43b4b7ebbee651429a/nujisipagakidixizutu.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/71897735719.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/tebakirakesuxisonu.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/43661897896.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a53df6b62ae1b5bafe5ba7c42f144940/bevimebopopiselug.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161480e3127d0b---70393266779.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/dudadivujep.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gujerasojusaka.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/sowomitonosizus.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/25744577663.pdfIn PDF document text
    • https://datajournonepal.org/files/faset.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fakojedubufaketulenuk.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fukodi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pamav.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/40191271316.pdfIn PDF document text
    • https://clinicscrm.com/img/files/wejuvosuxefurigokefilejem.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/82390869841.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/30744549784.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vetadebiwerurutoxoki.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911223624_3orgo3.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d30e21471df8608c487a73fd8bd5f77d/25896308970.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/laworijemefufufivijo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/titagitexojug.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/17173078085.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_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 18440 bytes
SHA-256: 0af3199235a73ceb0155737dea5f79461ab88eb37ce2a3e9ccc23168913cd611
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10076 bytes
SHA-256: 8c3b41bac4d2da7eb9bd6a11f128de725407007f60b337137a5d96b646572485
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.