Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76410dd873d008d…

MALICIOUS

PDF

92.7 KB Created: 2021-09-10 15:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 695ad4e043dd617c52fc09cb6443ac46 SHA-1: efa5bba09a8c964a909241dceff25e169847faf8 SHA-256: a76410dd873d008d719b74dc415bcaec53c367fac7a2dc3e5708dc430945dc99
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable domains, suggesting it's designed to lure users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to manipulate search engine results or distribute content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://haltia.mx/sii/ckfinder/userfiles/files/62758666946.pdf In PDF document text
    • https://frontivo.ro/userfiles/file/38049227973.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/91874920397.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2f0f379a---96900283124.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecbd2637d---temuki.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/xutujimofurugiguv.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/53430848072.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210831213125.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/pefetasuromonipof.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vubovutebu.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/22737084859.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/rupuwilakaw.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wozepukuvivo.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/66217188830.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6031adf3adbf233448507afe37eb75d/ripoxupizune.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/50944044629.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9307cd.pdfIn PDF document text
    • https://hse.tw/upload/file/mekirudoxisovekaw.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73948470009.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/44355823691.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/funipogujasasaz.pdfIn PDF document text
    • http://mrybalko.ru/files/66219749242.pdfIn PDF document text
    • http://artdental.hu/editor_up/pasazoxobemaxinigudolis.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/zabule.pdfIn PDF document text
    • http://praguetransfer.com/files/file/77487812435.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6jm5ri8r889she41oulacev5ba/zipilibeboboxixer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=scary+stories+to+tell+in+the+dark+3+pdfPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 24584 bytes
SHA-256: cde9ca230483e03b72bb331f38d4117001048af9414a736e30b1370c897776a0
font_01_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 11172 bytes
SHA-256: dd86f199cb8bd7df9ba3a8dd0c6cf21eefe7e6b6087729f14475fe31b5bab270
font_03_sfnt_off00014433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14433 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_04_sfnt_off00015988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15988 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8