Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaeca22a0183ec52…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f7bd59196cb6011a890542209cbe6fa SHA-1: b01b7166ad64e1b6f4c0825cc785190145671d79 SHA-256: aaeca22a0183ec52c082b7d7afd19aba6ee437df1c7ee7114478b7e21a153945
172 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a visual download button and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure the user into downloading a secondary payload. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lhsclassof1971.com/clients/74120/File/xitawotazukuralepimexuk.pdf
    • http://hvpeds.com/upload/contents/file/wexokitakukisanevositexu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/edd5d241ee0d72c7259b2a59521c2a8b/webagokofijezidikefa.pdf
    • http://wsmr.us/userfiles/file/bimuxor.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g7mtkulvqpq0da9e278hq7s603/suledezakivetas.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razonuzojorowom.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0559090c42---73209691137.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/dewaraxixatiwola.pdf
    • http://drivingschool-brno.eu/files/41961345150.pdf
    • http://dvarenda.ru/upload/file/kusug.pdf
    • http://candybeauty.vn/upload/files/wulavabesapeninujebos.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357880f0445---wawanuxokalenuwaxeg.pdf
    • http://www.ferm-matic.fr/upload/file/xapelezodopubozepetutujef.pdf
    • https://catbasailing.com/upload/fck/file/75189369356.pdf
    • https://aspaeng.com/files/image/files/nabamulepedutexeni.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/63030500216.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd384492f3---68625330775.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e8ece045d1bfddbb365c93db574841e5/66938535712.pdf
    • https://pacantioquia.org/aym_image/files/jokigukolokixuputif.pdf
    • http://metapolar.hu/tmp/97676151220.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c1787c8e---27680761785.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db4d6860b---74832882678.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/newixinurevabuvus.pdf
    • http://amon-syotengai.com/userfiles/file/jisexogapi.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/fewojokodimogok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=xam+idea+class+12+biology+2017-18+pdf+download
    • 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_off0000dd0f.bin
6eadc2e46fca68f055b15fa1298becc1e8e9e155be1a28d84da5345c06228f35
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 17904 bytes
font_01_sfnt_off00010b86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
font_02_sfnt_off0001239d.bin
bd0407634881a6238f4c1022e8b6977248b8243c7ebf9c496fca4052d290601d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 11696 bytes