Malicious PDF — malware analysis report

Static analysis result for SHA-256 320ab38f1f6f3559…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 08:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22701d16bc345207109110979ed25e86 SHA-1: bb57f331718bea7fdaec383d2cd874316e27c112 SHA-256: 320ab38f1f6f35595ff162456b66b4967a0f7babafac5c5281124528febf4db5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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=how+to+remove+phone+screen+lock PDF link annotation
    • https://ultralloy.net/upload/files/nezaragugilusabusi.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/89419855776.pdfIn PDF document text
    • http://scsychem.com/upload/files/93955201849.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a6d4e353855480b2d68210bcd8771efb/pozodejesogoz.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/18805738077.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/berorafi.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/24905579551.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/23325194169.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3d9554d3---porilegid.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vopuxab.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/kopifafej.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/44485963138.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd326b7504---37968535428.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/burewuxedibixin.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/nudabadigumow.pdfIn PDF document text
    • http://hainfelderteich.at/38393718540.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/popatowamemapemubimalapi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/digilifafufugibipa.pdfIn PDF document text
    • https://rintrans.com/files/74350453964.pdfIn PDF document text
    • https://theipbuzz.com/images/file/45303823779.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zijelosiniroziwul.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/65d75431e57847572501be0ba22f7132/37542266324.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca2ae7ec6---silapujesuxilamofijixukoz.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/voloxuvodarunodi.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 18184 bytes
SHA-256: b675f4689764e269e134dc7e94e51e49dd033c032951e995e5d4bd816e8bbfa3
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 10620 bytes
SHA-256: a067bdb9742b8d2eec2b2de0a0423ab6c67093a7bf3e9ae6acaabb636fec486c
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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