Malicious PDF — malware analysis report

Static analysis result for SHA-256 396ac9dfd35b9d8e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 18:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc89270eb288de6a95330fa31d5b05ec SHA-1: c20e3ec74bf181df8af66006e871c29c1f25f6c9 SHA-256: 396ac9dfd35b9d8eac73994173c2b996529ae0ce759cad152e18c5612c44ef82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggests a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cesiedizioni.com/userfiles/file/61676209320.pdf In PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/6496417344.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139053febc12---mixoluxurafej.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/38273482231.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/16064394645.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_80C12132A3E60750.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/1989861605.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/13086082021.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/somopepuvibasunirife.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/9806037586.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae50634447---3141187607.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/girogidiguwaki.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e1a9b547ab80151a5ab00fc152cf86a9/40998147097.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/lirixogofijajaduken.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nazisa.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98758288933.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/51886656936.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/dunawadafedimanubaxaveka.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e03b21b5f---salasez.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88275411425.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/voropupaxefofoloz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/neb44puu7h3thlirdml2e8gmv5/67770800935.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/65665941543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cara+backup+data+game+androidPDF link annotation
    • 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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 17420 bytes
SHA-256: 83759c51169ae5cd6801ac90b1594f03f4f333cca219280acf779023b4742469
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 11008 bytes
SHA-256: a0611846a7a9945d93022b301c85474f7ac9124341f79559a61f2359c1414e1f