Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37e818412cff08c…

MALICIOUS

PDF

93.8 KB Created: 2021-09-12 11:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4aee27588a993cec7041553948994566 SHA-1: 82af85c0eb6b9081dcad50911aa4587f42a636d7 SHA-256: a37e818412cff08ce473b70dd0606774e115c880fe8719dfb9c8f82b56beef09
96 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+put+picture+on+my+phone+screen PDF link annotation
    • http://saraya-shop.ru/upload/files/46018320787.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/loguj.pdfIn PDF document text
    • https://ms02bet.com/contents/files/pivowuxevajoxaniwoxixejo.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/gabokuposetapewulekini.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kesuropo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/bufemujejipenitarixojepe.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/893b681de4559513b757eb98369a2350/23788506299.pdfIn PDF document text
    • https://znalac.com/userfiles/file/biwepegirej.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jedamivigo.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/36047595562.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/jixadol.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54602989538.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/regodixowagalojobusigom.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/33315059716.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/83147293672.pdfIn PDF document text
    • https://kawanmto.org/contents/files/95126512772.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9298c8adfe7fe30c872397ed0576ab2a/9764320743.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcd67172---xatijunimafumo.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/guferobudebukutamusetis.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905211002_xps9g8.pdfIn PDF document text
    • http://davcpundri.com/css/file/zepaf.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d06bbba55b4f827008ab49572c4d6783/11780709780.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bujusan.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_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10720 bytes
SHA-256: c262e981970b3a2d9480099fbcc1b1776410ea54e6499f69faa6698751b44f2f
font_01_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 17368 bytes
SHA-256: 1566b908f6099da62b980c96da418ff073293a8283165726de2f87aa902abfe2
font_02_sfnt_off00015119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1