Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeb33601b92f93a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 14:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a79cf9a11f39566ca16cda77e777cb67 SHA-1: 3b61c165b1307c89c5f0ec507693f058d5293f35 SHA-256: 4eeb33601b92f93aea7a534e8a45aeaf7c005595c246e7d12ef9b871d9b28cc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614147082b1b4---19624229530.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/97800850793.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/ruxakatefafukiwenu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5f55942d---40952042086.pdf
    • https://tese.in/ckfinder/userfiles/files/laxenu.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lifudogarexa.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i3mtv892dtr509enf9sn8k2ham/meloz.pdf
    • http://stevis.cz/files/file/17136774169.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23582892097.pdf
    • https://newtech-utm.pl/userfiles/file/razoduvedat.pdf
    • http://imaginove.eu/data/Files/xaromime.pdf
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/35317869672.pdf
    • http://georgewongdesign.com/gwd/upload/files/57074009272.pdf
    • http://leebyunghun.kr/new/upload/board/files/3874280787.pdf
    • http://dongduong.net/Images_upload/files/9906862260.pdf
    • http://merwepizza.com/upload/file/bijikanakuvelisuxiv.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613057e02db3f---64995207454.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/754a883d3ae4b72398776e931edbef97/nafovizabotinowi.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/pikedutaduzotiberava.pdf
    • https://nestsearch.in/admin/uploads/file/83690448183.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391549d4dff---76986582198.pdf
    • https://aimhc.com/userfiles/file/45098556993.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613926207e6e8---35851801100.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+safe+mode+in+android+mobile
    • 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_off0000db11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
font_01_sfnt_off0000f328.bin
1633e1b990f1977af9b3d166a3fc98fb2f82248467fe2bb299607dbf80ad8db5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10832 bytes
font_02_sfnt_off00010c20.bin
f255b45ba71faf5d8f17e2095c45e882acdcbdc636ff53b72148468ac01c8772
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 17844 bytes