Malicious PDF — malware analysis report

Static analysis result for SHA-256 2852621015eb6d06…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 06:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fead3c0292f3592fce836c36e8658e5 SHA-1: 78524220c82638533a609d77810bc4ed375e7270 SHA-256: 2852621015eb6d0620018d4a088e929e269d900826c5114232dcb769d15ff94c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=probabilidade+e+estatistica+resumo+pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ff153ed6ce83ef795103923f7de3628c/mepojeromobuwuganoxipisu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4faa667672---lumazujelejigaxug.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/37344598939.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/fozezozugelusefit.pdf
    • http://ehomeforeclosure.org/images/file/gepotu.pdf
    • http://zerosquareonline.com/file/mugijibosavaloronifu.pdf
    • https://astdubai.co/userfiles/files/sumekodakejurepawijokevi.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/41969474110.pdf
    • http://maskaevlawyer.ru/userfiles/file/vigigixudenejes.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/3641fa3d82e9bb1ad85a83da449738cd/gajijimipevemam.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/44011442487.pdf
    • https://susta.vn/userfiles/file/dobovelusax.pdf
    • http://gapoom.com/upload/fckeditor/file/kegopoduruwobodipebojanig.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19156ab4---56876833015.pdf
    • http://kelvista.lt/images/files/gepumujomazo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a37459fcef273b55ac738be16172d9ab/darofusigabemekewegi.pdf
    • https://bursakaynak.net/userfiles/file/78877401476.pdf
    • https://mysmartedu.com/uploadimages/files/20469395828.pdf
    • http://purofirstli.com/userfiles/files/41234796108.pdf
    • http://akinmedical.com/uploads/file/79488930678.pdf
    • http://edukoc.net/userData/ebizro_board/file/wevelubobep.pdf
    • https://psychologgia.pl/Upload/file/gifijamuzaxof.pdf
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/54399028654.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/fimirugukonat.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3c543f40---11131233051.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
font_01_sfnt_off00010500.bin
0a0dac058ba5741713f933904a9922865346290c4d96926ee9e4b18b55292d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10920 bytes
font_02_sfnt_off00011e12.bin
81ea2814e2f7f9c5da0161b8fcbb37b9c1e9fc81325e6f613761f4624fbebd1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 22004 bytes