Malicious PDF — malware analysis report

Static analysis result for SHA-256 def381a06353dc7c…

MALICIOUS

PDF

98.6 KB Created: 2021-09-04 08:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4abea62babe21088d406396e5511b5ce SHA-1: e7d0801ead2a2b81674e506522df71394d832f4c SHA-256: def381a06353dc7c504c5033f4d5943eb83c6c7e8856d1e53259f8dd4eae667e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document contains numerous links, many hosted on compromised websites, designed as a link farm to obscure the true malicious destination. The 'utm_term' parameter in one URL suggests a lure related to AWS certification, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://duonglaohanoi.com/userfiles/file/54056167915.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/lepuxax.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/42699275548.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/suburokidexupaleluvoposob.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zosexojoteka.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/88378623402.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608405b7dc5d9---vavafisugiwuvewiga.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7586f4e271---19816238269.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/61649749507.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e94c7aea---6233398850.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/386851b7c169895f15646baeccb0004e/2117644551.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf7b80597---17731304186.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/88890208096.pdfIn PDF document text
    • http://kotolantopeni.cz/file/22450790772.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607142cdc3da3---xegitika.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/75129863906.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/82249640745.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/fijutafoledolisif.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/tamazakofazupexoba.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38005904573.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/45880200552.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/36071281550.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/5419270398.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/navanaleler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aws+certified+sysops+administrator+pdf+free+downloadPDF 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_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16832 bytes
SHA-256: 12e2c7715b5ad5050436ea2c964aed61fddfffe6be46855f910f674c7e950c3e
font_01_sfnt_off00014ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DE 10960 bytes
SHA-256: 7dccdfd95fc36b79ce54087064b39ae5e70ac9074c32c11ba5896424e5c12546

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