Malicious PDF — malware analysis report

Static analysis result for SHA-256 413e33efabfdfc4d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 14:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b3d5375cf8c8eac44b5bd8449ce64c7 SHA-1: 92754443c7a9be9b49e29d8ff2302af860eb22f6 SHA-256: 413e33efabfdfc4dcee191d57509d7c4684e4190f5680b6e659508627ea19dda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of multiple links on potentially compromised or disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hytechplus.com/userfiles/file/komuwevexe.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/genipupomosobobotuwini.pdf
    • http://srmtteaparty.com/uploads/files/202108132147318545.pdf
    • http://dobrejaja.com/Upload/file/rozug.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/lumeto.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/244ea8d36d6eae48f6fdd3d85db3a178/9920105934.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9c18bf0fc4489408281927f7f1a61343/wekogiwapafefifisineluw.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rll11959mvhj4o75tddrjadf8b/xuxalarewolaluwoxolig.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41d5de2e3---65999529511.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8aa5188bdce7b21f8fef378cda99fba6/80220620424.pdf
    • https://morabia.fi/images/file/pivukini.pdf
    • https://arrayamed.com/userfiles/file/gulukowopasax.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tixed.pdf
    • https://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdf
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/37653166409.pdf
    • http://solarexperte.ch/fckeditor/editor/images/file/majanujepibo.pdf
    • http://xinyuemu.net/assets/202108/files/20210820074533363207.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c9df416c1---13914282411.pdf
    • https://mauspro.net/upload/files/fizoz.pdf
    • https://medicabg.com/uploads/wysiwyg/files/71844995679.pdf
    • http://kehlux.lu/userfiles/files/80023711277.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d239994747---91577122965.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3295a52427---78829483562.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=verifone+p400+plus+manual
    • 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_off0000c3d2.bin
eee61cc49c3a0686687b7a855d9747e2a990ebdce744a6fd455330e4be98a56c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D2 16688 bytes
font_01_sfnt_off0000eeb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
font_02_sfnt_off000106c9.bin
6bf33b409376937071fc4607a8ccd43772bc394c8b2ce669e8e42f5432f931d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10688 bytes