Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4fdc86348bdc9d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 01:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 811b1d71a9c0ccecbdaf97b58c756400 SHA-1: 4206a35cec3d8f73191ff1c7963c367d1cd1c84b SHA-256: 7c4fdc86348bdc9d471b8f605d907795513ddd02c2eb5c3daf9c03c36f08d6c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=perbedaan+os+tizen+dan+android PDF link annotation
    • https://chief-moving.com/editor_upload/file/81476463273.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nipofuzugige.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/poxivojilur.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/newanizuxoruwumonebel.pdfIn PDF document text
    • https://www.confirmedtour.com/files/87315832617.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/jenakepimoxonemupu.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/moliwebijorewek.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/64982971301.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67166706020.pdfIn PDF document text
    • http://scpt.it/userfiles/files/13371895083.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/wariwaveziku.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/gakunowobevomuvavofa.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/54682672026.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/879e50f80ee5537da7b5b3cf50c721f9/zejusujamo.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/29361467696.pdfIn PDF document text
    • http://abwessex.com/uploads/files/vurimujadubivakiwovuwur.pdfIn PDF document text
    • https://thehouseproduction.net/file/rekatinexizidefogodus.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161423902007e2---pomezolapujolenufijoj.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/motedowepekasetuwapaju.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/80440572996.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9a867a5a---wudokalolegu.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kapam.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/budotivuvipozoxibaxoje.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/tafolovizuzuzarukenexenuw.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 18192 bytes
SHA-256: 1f9e8a43548ab5cc938c5feebe035fa4ad228be4301cfeede33badecdb3621c4
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10396 bytes
SHA-256: c612edc0333dea3b74afe05c1cdf440f243899af1c49f516f44c75f1f7863071