Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dcce39b52a2508…

MALICIOUS

PDF

100.3 KB Created: 2021-07-26 15:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 235e798688b56bb0ad2fc5cd7021e7a3 SHA-1: 327264f6b0036d4f8dfe2e6e240569e431ce41e7 SHA-256: 21dcce39b52a250876763dba4be6633700e6841beb5f2229758d0b878ccdd77c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading an archive, likely containing a malicious payload, by providing password instructions. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bjsf988jbfs6kdoefq6ohq4tj7/senuzizugudujivuwolaxa.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309c1388dc---43329140692.pdf
    • http://hnspkjx.com/d/files/kixatemularomajotoka.pdf
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/repet.pdf
    • https://aslimitada.com/userfiles/file/xizowuxujoxonabiko.pdf
    • https://kingyao.com/uploadfiles/files/20210704_170439_1782.pdf
    • http://metabolit-plus.ru/files/file/xokekemivegiw.pdf
    • http://nenorm.com/files/files/setesevazurogoletafa.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f0642731afd4e00467bb69d1fb1e587d/157809000.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cab36cc4f---xotokazirizipuv.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e49d9e1e---21572154322.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7929f85653---loledijezolifofi.pdf
    • https://bevelec.com/bevelec/dossierMois/file/wogamipesolupibojepikiv.pdf
    • http://aaykpn.com/uploads/editor/files/sexasiwo.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc1b1a8dc---91032143737.pdf
    • https://etonbio.com/newsLetters/images/file/zabexonu.pdf
    • http://stihoplet.by/upload/editor/files/dorekoxazitono.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934dcd69143---83781153178.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9de3f2e5f---memajates.pdf
    • http://amexeuro.com/an3_Uploads/file/84961042303.pdf
    • https://motelandratecuci.ro/userfiles/file/falekivegoze.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813cd38bb14---devegi.pdf
    • http://bukhatirhomes.com/userfiles/file/56511438702.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e946771a3af---15662309155.pdf
    • https://lapalettedesarts.fr/gestion/file/gegegabatotezidegugugex.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gpaqhb09nsidab1l9qljqplkh5/53867617207.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e017e06acc16bea6f30af17cea3ac41/ludazuxodef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=juego+de+tronos+cancion+de+hielo+y+fuego+pdf+google+drive
    • 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_off00011ed4.bin
273bbc75a3fdc732f897b960d120fc8953e4e79d70df6fa5d2c0c33bd7aab6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 18452 bytes
font_01_sfnt_off00014ddb.bin
f04ac7e4c8e366801fb477518b32ec745dc0a063d1f8dee54553d68149b39ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 11168 bytes
font_02_sfnt_off000167bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167BD 16792 bytes