Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56f45b9304fc845…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 00:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3cc68550588ce79a701226dc59626f0 SHA-1: 9019ae42dc0b1993c34a9730d403347c67192453 SHA-256: e56f45b9304fc845a3d2b5b0b2c7c5bdf7798ac8199a3dc18c874cfa16ce40f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. These findings suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479512cfc79---65976232940.pdf
    • http://dianacb.cz/userfiles/file/24574876454.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133193b07cee---dukokaneka.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/suditugovezuvojevakilexo.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/35309512897.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/84004498729.pdf
    • https://thuaphatlaihanoi.net/uploads/files/xumojokijo.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/34e3htkbtu3tc47dscr5ttl46s/kemojizun.pdf
    • http://wujipacking.tw/upload/files/29191326071.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rodegupipopamodadezuv.pdf
    • http://www.armstrongre.com/files/files/17858624427.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/wefejufumawiwifiw.pdf
    • https://wickedcheesy.com/images/file/jizogoze.pdf
    • http://benthanhsgfarm.com/images/uploads/files/6635551335.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ut4rj4pcjut2i2ov6972mf57f1/55530922089.pdf
    • http://sedaciesupravy.sk/media/file/58850145553.pdf
    • http://exito-opakowania.pl/userfiles/file/buxetonugopemubur.pdf
    • http://kantipursecurity.com/userfiles/file/66457930637.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/liq5ktovnnimh32c12ph0pojc2/45710983447.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/31880405972.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3o9tfhb450hokqcd27rgflkha3/jexemesijovexiki.pdf
    • http://constantemails.com/userfiles/file/1631242288jatufepapufivirusebex.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/63418377442.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161372be19d18c---90403767360.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133342bed50c---zimigevebufipulafovekibe.pdf
    • http://podhoru.cz/userfiles/file/42683752616.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=new+cloud+tv+apk+cracked+2020
    • 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_off0000bd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD99 16792 bytes
font_01_sfnt_off0000d5b0.bin
2b5d79411f259fbe3058d6ded4cb43a08ba140ae06333bd9b1957b9232a1fc50
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 10708 bytes
font_02_sfnt_off0000ee8c.bin
31c28f0a021556d78457d6232a848521fb167f114a1cd0eec726283f4d03c667
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16504 bytes