Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bc93dfff998715…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70bf793381dfda7320aa45348dd5c632 SHA-1: d034c42f58b27526fe8e8e80ab4a31cf5f22a06d SHA-256: 74bc93dfff99871564a597cde03842fa82fbf5572eb4a9bd94cfc4898536bfb5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites and disposable hosting, indicating a malicious intent to redirect users to potentially harmful content. The presence of a 'download button' lure and ClamAV detection further supports a phishing or malware distribution attack pattern. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://olterus.info/contents/files/gasinegojo.pdf In PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/92829272455.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/govobadojupesoleduxelagal.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/78975247667.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sorok.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/41689655289.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131307d943a5---5211278437.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904160950.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/23059835300.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/welirariga.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91e59f166---titikizuwuzazasorogetura.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20975e997---bizawezabitisasegegomikuz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108148838a---53780058768.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/99692034019.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/wexeluzesog.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7d931cceed48013615317d4ac0e73fe2/4565903478.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/80134563970.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/kokuletuwakunevid.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/rimefutumipatimunoma.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/28284661633.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/44233200960.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3osll3inrmg8s3i3v3cr8nfj2/nonijujoxebiraruwo.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/ab8ab7366e2ac3249aec667a9976072e.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1953e8a3e---duporijidanogikamu.pdfIn PDF document text
    • http://saint-party.com/media/file/zevenozelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fortnite+apk+funPDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 17184 bytes
SHA-256: 742d496e16c69aa5b56fa9652331ef49037a6fdbe862a7f6fd2d4e9f76b72544
font_01_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 10308 bytes
SHA-256: a627c0c2af6b82770e58a27106cfb6a772b60ddfccd51ae3027d31a0f193806e

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