Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41e76a7040fb4d7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 11:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 985f7ed88948ec8800bb0d4c6924729e SHA-1: 88e4b983df7e997d8f8521d0c00e7678f9786e40 SHA-256: e41e76a7040fb4d733a6ff6227da2278f8877b63fb03f60d8b661eea4a539ad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=can+you+use+an+iwatch+with+an+android+phone PDF link annotation
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/447fbc9a047ff140ba80cf63df925251/galewabedujefisom.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/lutekifelekojevin.pdfIn PDF document text
    • http://signauction.net/userfiles/file/botuwujepupetoz.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///rojenalenodujixozut.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/10779696408.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/wanobekesarumegusa.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/90244899196.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96228218515.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zujeromoka.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339fd027116---fozewesigajinusij.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vuxogawozodafozi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631034932_1.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/tezigovepa.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/32942085513.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/84622431931.pdfIn PDF document text
    • http://art-ball.net/files/file/woxuwadunideruxes.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/42122529071.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4af69c5a---mobipovivix.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kagiluwitapaxumonasodur.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lerukikor.pdfIn PDF document text
    • http://ranch.pl/files/file/50920703908.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/32938607782.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/18821172751.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/69442998856.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/34470480055.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 10896 bytes
SHA-256: 4edb03072b8ffd3fb626b63602bc62bc9fc4d2d98ff355640a2b6bd605cef62b
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 19084 bytes
SHA-256: 2bd4771d3261384fc391deb0d8183851c77dd855e9883c4ebf17aafe01a97ac7
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1