Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01ad3eac49ed83b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 09:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46a388ac77e0488679f439456c04969e SHA-1: 8cbe60178c13ea760d88fdc63e19242c74af2847 SHA-256: a01ad3eac49ed83ba9d8d57d19efd0c1648add41d3e96833496802dc401cc4b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=why+is+my+android+battery+draining+so+fast
    • https://rowsontw.com/shopadmin/upload/files/26047836748.pdf
    • http://ebiocell.com/uploadfile/file///2021090621504952.pdf
    • http://leadingedgecorporate.com/user_images/file/20502183234.pdf
    • http://ave-france.com/pics/files/guvodowowaxos.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db1ef4db87---fenonanejilup.pdf
    • http://shanghaiqingchen.com/upload/files/muwukepi.pdf
    • http://fabiocaronearchitetto.com/userfiles/files/gutedojujolagufazerukotu.pdf
    • https://goacetours.com/ckfinder/userfiles/files/xiwotuvaxipotox.pdf
    • http://terezmisszio.eu/files/file/kupolixomasevobejanavigas.pdf
    • http://agppi99.pretty-match.com/upload/files/39217119541.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/464dbfffe4bd9a58020bb6e0a4e2ccbe/vematowajaligufozejibupom.pdf
    • http://nyitotthaz.hu/userfiles/files/lusose.pdf
    • https://sportyou.fr/ckfinder/userfiles/files/39977252677.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/pekisapujiponesabanafowi.pdf
    • https://likeevent.it/writable/public/userfiles/file/vujoziribalaki.pdf
    • https://1000families.eu/userfiles/file/rosix.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc815d16f---jizomuzexezoji.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60afdc3c4---guzibotetoji.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e901a0abd088cd0f7b2c04d9f0b21dcb/denomekugalavasefovuxorem.pdf
    • http://creaorganization.com/depo/sayfaresim/file/luxewoj.pdf
    • http://iwort.de/userfiles/file/divavaferulodosijenes.pdf
    • http://zgic.ru/!upload/files/29234610199.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/35855033527.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lupujuvuloxo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614175da6bdf0---18843640147.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xikusurawapotufalifid.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_off0000daa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 16792 bytes
font_01_sfnt_off0000f2b7.bin
ebe5d65d6d5e1374f27116c5547240b0483a9de369a299d7ebea3d7d6f7291da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 11004 bytes
font_02_sfnt_off00010be4.bin
18fd16002a23b6310e8554f23ec494a60d4a78d9ec3400ca4243f8865bb8765b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 17268 bytes