Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19f8160bc146cf9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b08c657ac7577b126dc1b8b70480232 SHA-1: 731ae9d6e908af0629e458c6b9ed9e8358499252 SHA-256: a19f8160bc146cf9bfa36f903e26b36cebea5fd039d0bddae160d53e8681a5e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=godzilla+singular+point+watch+online PDF link annotation
    • https://candbco.com/ckfinder/userfiles/files/dixesasakidafozo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136672b1cf62---nupevulazuderoguvabev.pdfIn PDF document text
    • http://alptw.com/images/files/47366247165.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/86135038873.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/11951373595.pdfIn PDF document text
    • http://attlas.center/userfiles/file/negemewap.pdfIn PDF document text
    • http://air-con.ru/upload/files/6195453090.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/20827477470.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c8734a026ddc7717be1b2da4ff6d9c3b/64395662600.pdfIn PDF document text
    • http://ymmicro.com/files/files/38351403973.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d97e61e5---41125646549.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/45098120924.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/kosodabetelasenavir.pdfIn PDF document text
    • http://home-plast.ru/foto/files/motivuzo.pdfIn PDF document text
    • http://juncheng.tw/upload/files/nudolegepalepatud.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nasedazaxan.pdfIn PDF document text
    • http://telecycling.info/files/file/31039789202.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/lokagibuxevusixowumovu.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/19783783969.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/20939563765.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910090454.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/48944073892.pdfIn PDF document text
    • http://sbairs.com/datas/files/29734906060.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/24816225093.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 11080 bytes
SHA-256: 5f73a107bb2bfcf57c29d88ad5949cbb1cdc3939834137145857beedb0603ecc
font_01_sfnt_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 16628 bytes
SHA-256: e7b47f278f20bc3ebf90fef14bf3d5a2a869c3466025a7f53ac6671b69ab731a

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