Malicious PDF — malware analysis report

Static analysis result for SHA-256 240569bd2386a5f4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 03:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3797ea4eb006b68535fa59ecc89c8c0 SHA-1: 4208059f42764c8ed3195c81ed841137e576903c SHA-256: 240569bd2386a5f4c4b92ca6cc51ee874fafbb6e222ef877afe8219a06cce1a8
124 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and an IP address, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=mad+games+tycoon+android PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c68aa747a---26662917151.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c37151b1---lonopuzuworofakazej.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440ee87691---virepoxofojiwufomovu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/24117574983.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109022144005337.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wadufikekevebabek.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/75766682891.pdfIn PDF document text
    • http://glassick.com/userfiles/file/32735333828.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/ratagabafejexudaf.pdfIn PDF document text
    • http://bushurov.ru/images/files/50884080839.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/27162014377.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/21208903297.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/46083471337.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/kibitozabereduxuki.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/30017009841.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/guxokadovobimew.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/nobijategezowiwi.pdfIn PDF document text
    • http://oris-am.com/editor_up/biligegoxufopujakiza.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gikopumewevipiji.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/99326290773.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/kebef.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/61964091266.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613785883811d---detenetepetolumukikimep.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40569741563.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/33752882697.pdfPDF 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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16776 bytes
SHA-256: 46c47a534b4098683416d6fa6b8eda474c5f9a0c5aa4b6434c368005277064a6
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 10776 bytes
SHA-256: f6919d28c9c6f004e79c733f3bbc8a08c3ddf90e3d78e69749405becb96145a3

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