Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01aaf160eb65f48…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 08:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50cfd3824112b5c96801fc80bf58de07 SHA-1: 58104d9309943518ae2dfcc3d4aa013b2c418fa2 SHA-256: e01aaf160eb65f48a2dd97d405c1451ec9296cb13f59355989ffe90a77a1ed95
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or to redirect users to phishing or malware sites. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443abd2371e---32978220784.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gukavaviwimo.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/bibatuvimiti.pdf
    • https://nomortiga.com/contents/files/85210093692.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130441655c18---64952888805.pdf
    • https://balaji-technology.com/userfiles/file/dabewu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140900574115---20433667475.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/2153129998.pdf
    • https://semangkamerah.com/contents/files/14788501673.pdf
    • http://steakpluspizza.us/userfiles/file/mokomupumapukajoruvijomoz.pdf
    • http://donghozibistore.com/luutru/files/wirajimibife.pdf
    • http://tiwtactic.com/userfiles/files/wegosujilavadokaxetiniji.pdf
    • http://ahkkpcm.org/userfiles/92243028553.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/5872698154.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/nijinanonasuxakuk.pdf
    • http://centralgiving.com/media/userfiles/file/wamuleradopolemuvimitasug.pdf
    • https://ghnservizi.com/file/dejutonoruvirux.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146807abbc43---votuvozabeboginexeg.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/caa507c44a286a13fd76a12778f57eb8/65972259539.pdf
    • http://travelshops.pl/userfiles/file/tugipakamekomiguxivo.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/03c9a33ebd3d3df26aa7cf6726759ec1/53426093259.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/95563135487.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vidmate+download+movies+free
    • 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_off0000bff4.bin
a5e389818d9241b6e54978111391ce3bc6beeaf0649054e60b592e42323ae40d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 16528 bytes
font_01_sfnt_off0000ea6b.bin
2266f513021c13d68275ccb9c3237445bf218680ff824871d5af6933f740c51f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10636 bytes
font_02_sfnt_off000102cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes