Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36308bf659f6978…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7afb7d00e4505f07a666e20edee0b4b0 SHA-1: 3da7ae1f61df9753cdcb40aeb4a6f5ceb5e8ce02 SHA-256: f36308bf659f6978a067a1c0a9fd8e2a8ffb608c7cec5a7b2ada0ed2a00ae729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised CMS upload storage or disposable domains. These links are presented in a link farm pattern, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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=ludo+king+apk+mod+hack PDF link annotation
    • https://tjpapigroup3.com/contents/files/futepexarofokavoguze.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bc4a2655---tofabububetigekoluru.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/tusunefiwok.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/74559694825.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/xedozedolomumatofim.pdfIn PDF document text
    • http://contelex.it/userfiles/files/16102228358.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/goziwine.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/49552971358.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/92752705203.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/94918573773.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/90555829893.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1f67f15f6---23376990549.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/17973181824.pdfIn PDF document text
    • http://matras-devison.com/upload/file/49568732360.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/61397340953.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/27043651272.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///58903767581.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090707022773499.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/22226956392.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fenobefinatugisi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a082e6f3ed47bdb0123c737e6d279136/86329533292.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/76729027260.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_off0000b2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A6 16156 bytes
SHA-256: 41ae6f8de993a845b80b1911a4356015fb41c88067a6ed7468974dea61d867ef
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10564 bytes
SHA-256: b7f91a9278ff551eabec7d2318a9fe2d29ccfb7645b945a2575b90fdcb5375fe
font_02_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1