Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88031102d976734…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 12:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 71c55d159837fe348cd8703aee1bcbef SHA-1: ba8b103c51fa185dc925c7ce63496482658400a6 SHA-256: a88031102d976734b57ba7c9afcbd86e6b9ead6e16b499df912279b258e0a3bd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of links pointing to compromised or disposable domains, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hagithanh.hagigroup.work/data/media/files/kulizisijabipigoj.pdf In PDF document text
    • https://dobski.pl/userfiles/file/jesoge.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/20931060667.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/99355562589.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lovixitowipufi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/57768922786.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fd2b9c4f175fbb3a13dbb65e7fa5295a/22419739410.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613216b9774bf---danuwopudibazobozufupe.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kapiparuzuxujovotunu.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/57981104723.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/nexatunese.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bakofozagoj.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lutetofokawizujesijuw.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/tivisexutojexixevexabuzoz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147a199a3022---89606203982.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/87368825220.pdfIn PDF document text
    • https://totounited.com/contents/files/wirulojudoludata.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dizajosuzegabugonewujof.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/vasijinadexibikorurozanis.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/bidimodinefizagideze.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/81555386164.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1953966394613837309d1ce.pdfIn PDF document text
    • http://portableandcool.com/files/files/95916326004.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/dovaveweboxedategaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=memorandum+report+examplePDF 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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 10488 bytes
SHA-256: 202adc0b5aa1309c0a5e24a6d3b0437bc77ae926a7809a299899796bf6a7ae0a
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 16968 bytes
SHA-256: 917108d5cae600efe4789087fa463ded52b61426c8d2cebb70318c2c1b2269f1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1