Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8aad0caeb4c8a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 20:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05ea8a92e68983c90b2545e606b5528f SHA-1: e9373f554edfa734f9f5000f323bd75d21b39f74 SHA-256: c8c8aad0caeb4c8a59b01a1424dbad1d17fee593568898ccad9896824a15b7b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through link redirection.

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6ed6a89c---82599374216.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af97ee2ec8b---42894512859.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1d3b4613---zikujudujit.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/wexupalejukuxinafog.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ee84d1e7---60514269254.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/gadelegojopafasefetu.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/22453332241.pdfIn PDF document text
    • http://alvitraders.com/files/fexozixele.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b414cb8151---lonetexowe.pdfIn PDF document text
    • https://kawanmto.net/contents//files/81681983266.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210707_E97094D742B03AC7.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/vitojusukudibab.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3a4bab2b---nebutinifi.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/sidujavezoludimuxedu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/70789064631.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/29745342239.pdfIn PDF document text
    • http://195exim.com/datas/files/xanezifu.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/bebumib.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/081ft43dcsi5pml39ug9flmgvi/9098096755.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f34fb90282e819d24ec9bde820d5a157/74083402456.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c134a37c7ae88989074b821edd0e7589/54655752428.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/91426475521.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ff5b109fc95dd05b6fe5a93c97cee1e3/zinekonogusaxevagoxe.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/19529785892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=automobile+engineering+suspension+system+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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16664 bytes
SHA-256: 7bf464f592523dc9f3f1c606fd17ccd4d7fbbe4ca9f3da95ceaecfaeb4320b32
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 11012 bytes
SHA-256: 9e20fff576e53decad06da701490f17e00c696c401d91d62ad95847df8812856
font_02_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.