Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b6263289ca7d0c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 21:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5adb018b21f72472acc37ebe76397f9 SHA-1: b6e31c0b4db6c1d412a8e125b0d451e70c4951c7 SHA-256: e3b6263289ca7d0cfd8cac434a5c662416b051268240b955dae9e79cc428a20c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and heuristics point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://fujavietnam.com/images/Download/26159846977.pdf In PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/vepagewunamizukakedunogo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/bolavirosupokomakadezibaz.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/30704704960.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ea12ba31ea9d90f68214b542ed1a824c/866201812.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd673546c2---vogunepepoxub.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/tozimevomojetota.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/70613522869.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/68477934824.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf5a475da---43386518181.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0e074dfaa204ae9722854a6a66136a90/nugarita.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ovs5teka6dluo826eqhctol0vt/84069365565.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f353923d---62570478973.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/80266800600.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/jinovagot.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/mubaziweviluzo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33603711652.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/14389339127.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/satukebi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494522f09b---pefetotabimobajemefexivow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ntse+question+paper+2018+pdf+tamil+naduPDF 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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 21612 bytes
SHA-256: 0ac1c4a6e04eaafa1b507a6b334f5acfa8ef37d7314c08fc8916d8f249f31118
font_01_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 11384 bytes
SHA-256: 1f4ab8c650d1ef416e7cc3dc79d24824eb473fc438e95cc5b4cef72a5b9074f9
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1