Malicious PDF — malware analysis report

Static analysis result for SHA-256 38152cec583ba4dc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 13:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30b028901b6b49a8ce700a0b23cb8d1a SHA-1: 12a16892ce290bc72c1bd3617a8fe2f93ee7e70e SHA-256: 38152cec583ba4dc0eb232bf3a3ae5732ad190a72a45f3a1044c8cd89e1c7ca4
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external websites, several of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://chieucoingason.vn/files/21145052933.pdf In PDF document text
    • http://m3hotels.com/userfiles/file/94966291693.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/18649736333.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/zigajubu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/43851044349.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/81867780395.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/17932634704.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161393b72f2795---35421084567.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/28738786516.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jujotukipizuxomad.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff30af8b---goxetiminuwogos.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/84947769730.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/67217187842.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132449bcceab---92892151608.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/51617177360.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4pehm5m0gefq2mso9gerfv2s9c/bugase.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vonabaketu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/334767b92dbc0ceaf33f3e602ae07886/dosawebubimatugoxapamel.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/36833949702.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/30427873935.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a7m6j1ic0bungo0uu04366b1jt/bodelemigadexekinifologew.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/65300184762.pdfIn PDF document text
    • http://fedime.org/imagenes/40303934212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shall+we+date+gamesPDF 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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 17276 bytes
SHA-256: 39239ee06813ae85768c3d71314f186c7fb53c4b5510a15cf3bcdc04747a6d84
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10440 bytes
SHA-256: 5d586098537aca50f68af73fefe8fee045db82de49115b6550ae2829cf34c04a

Open this report in the interactive analyzer, or submit your own file for analysis.