Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff3fa3910b49a2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a602f01cdb2359ece115ac58af2a3d0d SHA-1: ab8c51c7dbcd1eef82be3142a5c4b408a4559e1c SHA-256: aaff3fa3910b49a220b119c1e0f2dd5ef86306908cfd9ef79101b25e4015a661
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=mechanics+of+materials+9th+edition+solution+manual+si+units+pdf PDF link annotation
    • http://dayou.tw/uploadpic/files/202109120024176499.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jnq006l14f7s51umcdncc87bvd/39187184386.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/97148979984.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/45078406373.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/43404273874.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210921_130030.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/ramizigafepajufudetofet.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70036241592.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/8129526784.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/7532620587.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/45720606786.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/kogobiwobugad.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132634ac16e9---pudewatebiletuzokigo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/86475471882.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11398b154---813036077.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109132121498238.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/18871506822.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tufutifapabo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca222a152---dititaro.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/mogopuze.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/14650481519.pdfIn PDF document text
    • http://tdbm.vn/upload/files/netufel.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/63916697767.pdfIn PDF document text
    • http://mfahk.com/upload/files/potaroratuvusovekeretora.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/garafasedokoter.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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 11148 bytes
SHA-256: 5f8aa91a5b40f6e418ecd5c3d67f527224ff1fd01fe1df0776d14a74ddf8852f
font_01_sfnt_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 15088 bytes
SHA-256: 0f1101f8e9ea04454ef9bbe0d24ca79d7aea9b77defb021fd0cd93ec29687c32
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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