Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017cce53333b794…

MALICIOUS

PDF

91.6 KB Created: 2021-08-14 09:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e89fa55bb3cde944e0c319a4bd5d1215 SHA-1: e6a6f01b39d064f9944d63e9cd8ec60019ed6e97 SHA-256: f017cce53333b7940c9ff69b5ca93a83915e4886229c956a85381a78ad604fe5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to link farms on potentially compromised or disposable hosting, further supports a phishing or malware distribution scheme. The primary attack vector appears to be a malicious attachment, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://matrainagycsalados.hu/userfiles/file/pukitukenobotapuko.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fv43cl3jvp4984iiop222bb3q3/31053182706.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/vesidibikudixob.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/75765583086.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/52383014217.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/pesaziwu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0c638477acebcf869abe226204c9a6c8/bagoxejaxusuxap.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zixodaraworej.pdfIn PDF document text
    • http://debden.org/userfiles/file/zumanaxaruduzowej.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/1469710470.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/95ce42ad5c9d8d5e56fcd3a6050a46de/xisezabubogovawimum.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db431184de---98886978648.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99991cb03---gagijorige.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6107a107b---kokepikaraxoko.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/xotaw.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/tunekiguxikevub.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/zijadimapotoviwi.pdfIn PDF document text
    • http://royalgroup.at/tmp/foremigidove.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/19444610146.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wojabapi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nasoge.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c4a5dc875f1b91ee3c65c8cb16d76cbc/28678141647.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dexupadusafevobofim.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4b29109293de824d497c21756cc7ada8/numet.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b255b00e76e---87814351111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=restaurant+business+plan+sample+pdf+south+africaPDF 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_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 17668 bytes
SHA-256: 2a88d9132776f7696e48444920254b237c764b4b31f20342d340f666f3a5bab8
font_01_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 11172 bytes
SHA-256: 4cd05d03324d163eb3121f0953d11e8101c05019e00aae50101740d3548cd389
font_02_sfnt_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1