Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dda0897fb9ff08…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 03:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b089cb4408f1d1179afbeab75a58565 SHA-1: 317e9d023dbf035ed78cf7f850d87be4e0b710c8 SHA-256: b3dda0897fb9ff085ae6edabd62530165e30a3cb538f785c3e636c647d01bbbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://murielbellhomes.com/userfiles/files/42376405173.pdf In PDF document text
    • https://markaoyun.com/calisma2/files/uploads/palagazos.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/fixazuwerodejika.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/45978482223.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_213145.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161380f3cd8764---disuxifepisilinekozotu.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/bozisotumamolowigixigaj.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/farejokavovokidonuvatejan.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5c37bf97ec33db1c73ad8bd5d1ba7c3/20214335237.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/lelefulev.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rezugax.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109121145489489.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fafea59e9---xupokovixovediremomatama.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/87487476359c6a81028f9d007d28c494/11679084431.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kuxomubujinafu.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/33727407078.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zuforatozukovub.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/gasorate.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/20868027459.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdfIn PDF document text
    • http://tiquital.com/documentos/file/67869322463.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/woxeroli.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/putodopuxomuset.pdfIn PDF document text
    • http://hkwwta.org/userfiles/66158218745.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/vemugefibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=idragon+movie+app+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 17736 bytes
SHA-256: ed10619a8f07108bf4affa82fe8f12bc4370d27421c6220230db83d521f29121
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10532 bytes
SHA-256: 3e5564afaba49216cac1b47fbb8f5798a497aea0dc2aa048abc9a34b50c5848d
font_02_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1