Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e7028fa89dd8fd…

MALICIOUS

PDF

71.0 KB Created: 2021-10-04 01:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe7b19bd9a08406ff9db02c5bd50587a SHA-1: ed7da5633d2c044723e722d205653969f2167de7 SHA-256: 88e7028fa89dd8fdac6c80f700f5aa93a019cb024d3bbc279d0fa5bd55125915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vntsd6l6152a3qdnhgsrja4hf3/sagalotebumot.pdf
    • http://solmoda.it/userfiles/files/zojugugi.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/lipewekumakon.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147f0a44c1b8---napasarofufiw.pdf
    • https://univerosg.com/ckfinder/userfiles/files/11012710885.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/libesozagire.pdf
    • https://airflow-skateboards.com/upload/file/96507449635.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf329de1b---3571156653.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/98771273627.pdf
    • http://phongkhamthienhoa.org/images/files/69277320863.pdf
    • http://sxnqx.org/upload/file/Fl202109272024575976.pdf
    • http://thechitay.com/uploads/userfiles/file/fobonewubaju.pdf
    • https://horkolas-gatlas.hu/ufiles/file/33987296054.pdf
    • http://ourpreferred.com/userfiles/files/42141981798.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/94020887487.pdf
    • http://studiomalpocher.it/userfiles/files/88381945838.pdf
    • https://lrsdev.com/userfiles/file/78912873332.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/gogiteginuk.pdf
    • http://nemdanangpho.com/uploads/2021-10-02/images/files/22440544735.pdf
    • http://elistaprezentow.pl/userfiles/file/gitexogomi.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/guliwuwuvazokukipi.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/91165135730.pdf
    • https://tigapilar.com/upload/files/99697299135.pdf
    • http://bk-plus.at/userfiles/files/58048624851.pdf
    • https://hotlinepro.in/admin/userfiles/file/zozokavubagiluvim.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/749717957.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pyrexia+meaning+in+telugu
    • 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_off0000b581.bin
94a38dbf749be4d36b8c7e2c17890d88570b7bb57acd1a3615581628f2333fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 10480 bytes
font_01_sfnt_off0000cd55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 16792 bytes
font_02_sfnt_off0000e567.bin
d019404f66337c4d29b9ff6e525e749ef8e5f3030cf8cc4587de96a487faf90d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 15924 bytes