Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac780d53424c30…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 21:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f8632c6aa23ba3f35fa66b1f39b2fe SHA-1: 4d668c172d79deba122a454dce451805388f37ed SHA-256: b4ac780d53424c30904acdc6385be91de9d136c31ab50b99a3bf6a423e09f9b0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be to lure users to malicious sites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sharadsangam.org/UserFilesTwo/file/1051968077.pdf
    • https://alamansyria.com/userfiles/file/tepawukexoxirapuwes.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ce9ccb70---54595995886.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d87b3d2af8eae351d728067ef22165b6/lewawafiv.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d395287d540f11f34eb688a0c67cb9fd/1148130604.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/71841659944.pdf
    • http://orchid-daikanyama.com/userfiles/file/vutiwixe.pdf
    • http://klccpa.com/userfiles/file/rajud.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wumevabana.pdf
    • http://cayxaotamphan.net/userfiles/image/file/7090751902.pdf
    • https://myphi.biz/nbloom/fckuploads/file/38863716010.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a9df490c02a64f7d8948ef64f91c4c25/rabug.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58202343569.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160768708c031d---37506587851.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63b33dcd29---mamuvew.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d73ba4f272e986214b76a381a197a3db/motov.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2df4f22097836f86d5c1cae134ac622a/14167593955.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf137a8e221---48327069538.pdf
    • http://catgarner.com/clients/873270/File/gerefazesutixagukazad.pdf
    • http://sosnovgeo.ru/userfiles/file/gejudas.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fff7c3023c76c750ff2235f42b23dc24/xazigitakenore.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/jonefarexefagapi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbab2bfc4---38298182553.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+body+keeps+the+score+worksheet
    • 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_off0000f307.bin
6bb9fe4333367b1c824fdd55529a492ed3966672aeccb9c046032dc47e14b234
pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 10604 bytes
font_01_sfnt_off00010b48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
font_02_sfnt_off0001235a.bin
a8b1b92f97c3d41da7016db57c1b9fd3d564bafa3fceb1a54d5dc321068ca4be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 17436 bytes