Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec39c401f26f40dd…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 19:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e205261be52fbe6d088e4815a434ab0 SHA-1: 90d12d5eba69a801cc372a061e3b74685a6b3924 SHA-256: ec39c401f26f40ddfd83dc3d3df3ead2a045709c4a81b1c6f7ffd421c004bbef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31a8b39f8c519ee15e5242bf595ff402/ninotezejokisazut.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6b75185f92713d9b31702596c78c738d/sanomizonili.pdf
    • http://tradeweb.es/userfiles/file/gowujadidejutoneligate.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c72abfbd0---bimojazoxevi.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df217505f2---25577682855.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/691745be0694486f470b1d581ee8fe33/92645406842.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/25631266468.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e93652a06cf4b5e69f7cd55f98a594cb/88641239026.pdf
    • https://viettincapital.vn/upload/files/rumozutogaseloburexixux.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946d5833bf---fakozokigekedig.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/964ddf8ea7b45fa80612be5ea00b9c89/18039017629.pdf
    • https://datawire.gr/files/files/wazujimenarobegexudekuxo.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9umvieto2glhom9hejlbtka20b/11939209071.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b3c7b24---51109843135.pdf
    • http://haenuri.net/ckupload/files/96172923028.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd91f98e69---xojaludepekulufifu.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/46bba690fbdf8c6601bfb0174e40c5eb/90637216600.pdf
    • http://thepokeluau.com/uploads/files/36751977501.pdf
    • http://finemetal-cn.com/upload/files/99394362196.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/dusavasuna.pdf
    • http://sistersaviopublicschool.com/userfiles/file/13002591641.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31cf53da1---xetewevojovuzumejelukorod.pdf
    • http://cariboohose.com/userfiles/file/17781876196.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=beautiful+redemption+read+online
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3096d26e8b0c96dfeed00dc0f298db53/pedoj.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_off0000f864.bin
18e62c9b858f1b6436119a27bfbc6bb8cd1aaf5369b087cf712357c3b9ca95a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 17568 bytes
font_01_sfnt_off000125c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 16792 bytes
font_02_sfnt_off00013ddc.bin
87390606465e08a91dfafd1c09b6eb30868caba0e4b08353e74b5691c5f9b83b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 10644 bytes