Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e7479a6133dbfa…

MALICIOUS

PDF

90.1 KB Created: 2021-08-12 20:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98eb5ccf960a02e779800a90cffd93c9 SHA-1: 72ec248cd6488ccf92c847c6f932d3e55e947337 SHA-256: 70e7479a6133dbfaf020811c2361e3df1b71a2cfe5b557e5cd0cda5944d26326
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The presence of a visual download button further supports a lure-based attack pattern. The ML classifier strongly indicated maliciousness, and the overall structure points towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 https://queure.ru/uplcv?utm_term=jurassic+world+the+game+hack+apk+pc PDF link annotation
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4c374c77---xovif.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/18110946917.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bd02fe604aeb4f1eaa0e0b01cf9851ae/donerumapinomob.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/v892aji6uicljuts7lt4qaj79r/87664892985.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94b74d85df---damoposuzozoxubojibisewoz.pdfIn PDF document text
    • http://thegioioto.store/upload/files/bulevisona.pdfIn PDF document text
    • https://digireg.at/upload/56258550574.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/20384b641f5d77912cb4e2ec9aa4ba10/17913748070.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd2a4fca5---sulinonoliki.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/mebadowolepasibewe.pdfIn PDF document text
    • http://casaalu.com/luutru/files/82126525514.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/kovibutaxob.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd5adbf82---79061910060.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c45c9fbbf---nekitomevubaxelomotuwizax.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/62163062662.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a39ad4a7d14991987563320470f92717/37725019616.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf96v9ied2g5qi00jgeed4h510/33445294421.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5ffde5931453ac5429e376139fa0561a/tenutusesajiwekidam.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0e8ed22c---pizavapawuti.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/45e34bacd982f96f5cf7a94af547c261/88920001435.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/dujurabavetulajigafalitaj.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/520d385604905fcfc6a214b2612aabc8/92696927324.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4179036dc47ed5c20b9b64d0b642ed2/zukenexuvekid.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://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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 11128 bytes
SHA-256: c2049762c6e4b6bcdc532bb73a86f80cd9b333c4b07639fe0ba8052e0cabd0ee
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 17048 bytes
SHA-256: dfb63132ac421b11839f5242ca275e36ea81cabc16984852818d00a1c0d7aa57

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