Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3bac7c4fe3eb1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 04:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 222954fedfc17e14bffc54a39ad6a9f2 SHA-1: 9e453904aec309227325e06c1de75a6930e34100 SHA-256: 73b3bac7c4fe3eb1c65a3561982276fc8ab3aa954cbb206bdb53b603ff15a69f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, which in turn host further PDF files. This suggests a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ipceurope.eu/assets/file/simodefanegamiji.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c26340ba---91940830545.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/92488933328.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/59705044342.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760e7cab3ed---junamuxepemumirebak.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ea35eca1---barorofidesosurajadud.pdf
    • https://dbjadow.pl/attachments/file/27684817359.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607142f99358d---81439404263.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cad12dd10---2836873568.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b81943665---tasopexajuputapetejes.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f222789c04a822976ce91b1b5f87e72b/pevoli.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hnuu853fgfd5laje31gh161d1t/dovevebi.pdf
    • http://gchs1969.com/clients/867877/File/tijukeganajik.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3fc1f7a8---kakozina.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c790a51cac8---tezinibefodonopamokuwepi.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab4592974---12724525659.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rqq9c14q57kg1n28medv6mitt7/sewotibezonekawireme.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/n0uijqnuj59nafno8argj028ab/setamipefokez.pdf
    • http://bielwod.com/userfiles/file/52807373692.pdf
    • https://aawyx.com/sites/default/imageuser/file/5025776888.pdf
    • http://studiosaletta.it/userfiles/files/35114978257.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9b70fc42aac23f79619228b953c0b397/70096509658.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f219027f1---jarirefukode.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadac2d91b---80708844794.pdf
    • http://vnos.vn/app/webroot/uploads/files/zubiraxenifowivudojogiwu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=formal+academic+writing+style
    • 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_off0000f8e5.bin
d0dd065e1c7fd8f435af6130f7eee7846a1d77d252a8837d3d5c351f329764d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 16788 bytes
font_01_sfnt_off000124af.bin
9baf37c8636239993fade2a7a64e4f6dcb163b900eb0c8580323ad8964cad472
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10892 bytes
font_02_sfnt_off00013dbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBB 16792 bytes