Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ff142eed77a646…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 22:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0cc95adb9025af79c4105af8ecd4697 SHA-1: f7769493c3da11fc2417318a17f6d6b98d14f8a9 SHA-256: b9ff142eed77a6461bd053dd99b0ccaa74ccedf3c9a9c82ae484c0ec82f81f47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites. The heuristic firings indicate a link farm designed to redirect users, likely to phishing sites or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=app+de+calculadora+cientifica+para+android PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613164a68abe6---nebejixokitefoze.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinivibejujexigifazixilu.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/92664437250.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a3000a7ba5fe4c5fc785c85b5c26e59a/noxitopofifemozetefiziluv.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pasebizizidi.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/89101998744.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/rifaremomaxepakota.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/41964832653.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/21020728293.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/86500506098.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc482b3819---12640815271.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/mosepimerafepij.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040110262165.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/rivinuladubetezalelisosut.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/87819278693.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/7744623564.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/36875865526.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/wurunorukifetobibomaxasi.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/55954615093.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/mesivexenitatikisoro.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vuvekatisasesupaso.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lubasedojogufigi.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109151729538798.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/lekejevopezozulusafoz.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/rirulunonu.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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 10528 bytes
SHA-256: f75bfc8d8c662dbe0c123e75200007758983e90a388586c9a5212d309b8e3c12
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 17716 bytes
SHA-256: 3254fc307a652bffd023e3436600284bce9a3ef5e16f1051135b09759f9921f9
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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