Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e84730327087360…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 12:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 398155965220725ed0d99753061099e2 SHA-1: 4176f3a240cffedfab9ef5cbe0b5ae3f7d33d903 SHA-256: 8e84730327087360019dc7f6c0fba4e6bee5517272e8b3797d41a3c08ac4d1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the structure is a link farm on disposable hosting, designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=launcher+launcher+apk PDF link annotation
    • http://a-xian-coat.com/uploads/files/202109210236257853.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149f32dc1202---20732702330.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/sirugij.pdfIn PDF document text
    • https://wita.lt/images/files/58342124294.pdfIn PDF document text
    • http://ipceurope.be/assets/file/2743818130.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/gozuzaxenapada.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/72635083146.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/49231031467.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/10404632779.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/18099587516.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/20182253860.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2ddf1745b2e64ccf413eae0a6255a679/gixukuvexuzema.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/15680253754.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/57349440946.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e2c222ca32ddc94ba870927b08d5c1a9/tadudivapokov.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/38731329615.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/740e1bcb4b55b0f9cbc93d95c0c87239/16682643805.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/3244957951.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/zexofadaxevar.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/vabazudowimepi.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/45925475247.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zizunukotibodewak.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/27356887096.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210924144949.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613632acc41c9---60723436435.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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 10140 bytes
SHA-256: 32b2aa9d020110e9ef05f73be9085af8d0c2a62504a5bc921bb9c654e0eab428
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 17488 bytes
SHA-256: 4f5bdc2e52aa88a5fa14b345ed41add6a3847968614b19ddcfa53ad5eba62b74
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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