Malicious PDF — malware analysis report

Static analysis result for SHA-256 72874647b610da86…

MALICIOUS

PDF

108.1 KB Created: 2021-06-29 03:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36322168b2ae411f79cfc49a03ce740 SHA-1: 76eb9c6ccaaef868a2731698187baaf145c9cc8e SHA-256: 72874647b610da86b828d6477bbb4755565c669aba4ddd1e924fbeb41ea398a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://614move.com/clients/4890/File/marifufo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/18eb9729062fff051a93f42e330d1287/fomaxuwosebapuxewa.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e914fca71a9acc4f1956489172cb82f0/40809350133.pdf
    • http://ekolojikweb.net/upld/userfiles/file/xifakegekagalu.pdf
    • http://suamayin.biz/userfiles/file/rovokebuluno.pdf
    • http://lapenya.cat/imgjovesnaves/file/gedozenanefovug.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b3264dafc88744c3921b6a6fe87c076e/48961838064.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3c90fd7b549e5539a306f5adff20abce/bobiz.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc91f33436---kasurubojelinakoputadumu.pdf
    • https://agermag.ro/mm/file/90808931132.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ca7437c0a6a774bb1ab25b4242ab3c/80034892263.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/xofubijosozolelov.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad398766b60---zulifozezalifanotumixo.pdf
    • https://widepolymers.com/userfiles/file/susapokonej.pdf
    • http://smflow.in/admin/uploads/file/bulozuzosozafopojatoj.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/befanalukiwup.pdf
    • http://gardatrans.com/content/Files/87993979379.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d7a11052---95112936694.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2d83394d27c8cb02c9e5894739b176ae/371521173.pdf
    • https://classconnbio.com/img-jacson/files/39894531622.pdf
    • http://montaze.org/democms/userfiles/file/87207769763.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xuxepijisosopuv.pdf
    • https://najlepsze-w-polsce.pl/uploads/tuvefezu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=holy+oil+recipe+in+bible
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012780.bin
fb3d94aff910dd4672e98b2f05a76a7928f28fabaf889dfb4cb9bd98f170e0ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 19096 bytes
font_01_sfnt_off00015838.bin
0e37d1c96d776d8c790623de34accc34785d844b73eeceb80896c21b2e15feba
pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 17836 bytes
font_02_sfnt_off0001740b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1740B 16792 bytes
font_03_sfnt_off00018c22.bin
93f8af62ba72cc7c1d9d2793a9db148a71fc5780000d488041b20caf6260f495
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C22 10184 bytes