Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a198f42d9f95db…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 01:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5ed4f9b37ec509fe9b7f395f55df5ed SHA-1: cdb7ff7be4396809edf90af7e562cef2e1ed6395 SHA-256: 23a198f42d9f95dbae2db2340fe32745075005175bea25fabc1f8b801b12b66e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple suspicious links points to a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ae68648e---nonixug.pdf In PDF document text
    • http://babywagen24.de/userfiles/file/41266031474.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8u3t8ekrbitkqeeh0811dj2l8m/4637828743.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/17248290461.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/bokanubisedi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/91909833976.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/71ohfqhai5d3ughuc2h0bvkng0/62800884689.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/35128502927.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531161316456930.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7fbc3358---vanun.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/sasituraxalujino.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ffca962dc---33373267938.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/43a8417d06b9c4189bd41217607380a8/bowosewiralujav.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea0ddb16b---lemifotum.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6dc0b672e46675092263dacf8d52d41f/6752371600.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e4937162a89.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/29664940654.pdfPDF link annotation
    • http://miydz.com/mingyi/images/userfiles/file/zufuweferaxugib.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/29158d8bb5a56450df7f8c5ad920dd68/98781514569.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249bcd4c95---pofuruzi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/maxulag.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107062357125951.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c03df0425---tomevab.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/45323487222.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/ginizalotawuximikago.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/18526450609.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/fajiwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=caracteristicas+de+las+ondas+longitudinales+pdfPDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10928 bytes
SHA-256: a0cf656fdd2ee97086bb01ed58be850f3e18e0d7ef168d3a29a3f9d8d84d0492
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 18036 bytes
SHA-256: 60780cde038b7756812bf98a432bfe13d762764d14047101e004e4ae5defc698