Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac744ffbfc4c843…

MALICIOUS

PDF

72.3 KB Created: 2021-09-08 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c4e1fca3e9e69d30780f9970e5bdf49 SHA-1: 4e9c4c988508b9e49581a78ff9f732dfde06865b SHA-256: cac744ffbfc4c84327324005f0c900299306ad02df94ef7d8067b89174782a06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, indicates an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://warungmimpishio2.com/contents//files/25082701587.pdf In PDF document text
    • http://slsnn.ru/content/file/nutadal.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/94233813997.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/76319820793.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/177224062861314b826500b.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210717_0A0493A669A55E9D.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/igscqnek0ff9jd5vsp8hi7epd6/21475503067.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/57989094177.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ccea0d208---12380832056.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zukejuzotuxexadeladomaz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a804ce6b25757343e2e2fc9845e4082e/donanogonebunegapa.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pecvbprvogqh6vo49k87l456br/juvijimedapanomotogeture.pdfIn PDF document text
    • http://dzbnf.com/upload/file///12553435102.pdfIn PDF document text
    • http://splogservice.ru/content/file/zulirazu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/63700064963.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kumovirumazek.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cdd8ac5c4---mudepozoxupovujize.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3ru3kauahknbh0kf5hodepjrc3/2074965449.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dilufulovutikigekivigoka.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ravira.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/korow.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/xivafolupaduso.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210623025853.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/69520454831.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/19720861076.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/latumovexajul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=student+book+touchstone+1+completo+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_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 16036 bytes
SHA-256: a835e519db3d1a93efdebc69e342b7983ecc5b57e5aca83b8058acd2f8dabea4
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 10988 bytes
SHA-256: cb942ec9fb0c7f83b3f13d21d151815e664f9e221bccdac9e3841c232f98c52f