Malicious PDF — malware analysis report

Static analysis result for SHA-256 0586527fbe4f3472…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 20:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 141c9353e4ff3d529d69348df53facca SHA-1: 7ab6d0ac9ad53e0cc66e96c3095cac81ab302617 SHA-256: 0586527fbe4f3472dfa5c67c1ff27716b34284adb22ca0493bafe1c9db8da467
172 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 compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=download+critical+strike+shoot+fire+v2+mod+apk PDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/kojosune.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/jeduwukoduzelesa.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/karuwamafedamigakepimet.pdfIn PDF document text
    • http://citra.cl/userfiles/file/luwobiduvifadar.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/kowaveboko.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/16314943963.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wotuxo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e5880f0b04a3f7026b0fabf2635ccdaf/dolisoju.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5734ej9m2kubf56snag5vp00g1/tavejuzisaluboje.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd44e8abd---9814013755.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/osjpdtnrbbg749qg6d8170od9r/fonujas.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/94703661412.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/fujomamivuzagenadilokun.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/65925922015.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/vanewevokixotitimekafi.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/suxarokixegu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/leviko.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6872d1c246---dibubifikuri.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fosexanesi.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/9115310038.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3ddd4668---kubugor.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/siviwol.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ccc46101cd60bd5519811e1957377db/63499466947.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6201dd0869---83987211779.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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 11252 bytes
SHA-256: bcbe778bbc7590b92599849696470840bb04c3d2ab1c57b67a9126894f7ba158
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 26764 bytes
SHA-256: 49df4df73d9eb7f4edc16ae414f2f19dd0cef332d3b106a5563bde6b29ddad3d

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