Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279daa70c799cba…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 09:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 805117692e1d33e47e8d1dd31266c46e SHA-1: 8c6846af57352c6fe7f54c7b4a15a2c8169d866e SHA-256: 2279daa70c799cba0b251860dc7a71f971745af2248ec98731eea48facd44c87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to numerous external URLs hosted on compromised websites and disposable domains. These URLs are likely intended for phishing or further malware distribution, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=time+conjunctions+ks2+worksheet PDF link annotation
    • https://archielectronics.com/userfiles/files/48581202730.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0dbace141034221a470ed94b15e42de8/megigilapeg.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/befadorabawijejen.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/77696856828.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/rulowejixulowu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xivinokesapijetegov.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/at1f3ibedjdav5p3a6gnat9hok/32913887503.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2c2c4b467e9e96e14b7979b26cfadd49/xanojuxes.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lazuzijusuwedabakov.pdfIn PDF document text
    • http://deforma.it/userfiles/files/padenavolirilamuji.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/dubofolulax.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/32264456364.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8407e5b1---89382731443.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad446776a---95048402781.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/55449829835.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gavekigojazizopuxoxeg.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed1bc30a1---89810546626.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///84122952360.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/39881362082.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad0480d9a---72812172384.pdfIn PDF document text
    • http://zerosquareonline.com/file/84027863830.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/galepelaguzo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/52777847741.pdfIn PDF document text
    • 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 10780 bytes
SHA-256: 4ad9ced78877d7dd04372176c3e4ee0fc84c5c1217f2daa19471f6ac50869a53
font_01_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 17284 bytes
SHA-256: ba30e028da076a7e57b5b36df40cc4c52caf2a03feef71378a0f1b3d43f9c071
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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