Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f993d63ecf998e1…

MALICIOUS

PDF

98.8 KB Created: 2021-09-06 13:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8db96eb526952d68058c279a301c1955 SHA-1: 82a9b08728f52eb8b9723e6eada1149970a8222e SHA-256: 6f993d63ecf998e1418d8569f2294955b2442ea7a3cd687c3995e79fb3782feb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://shqinze.net/admin/upimg/file///menefonaxi.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021514123658458.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/97131378704.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/58536337051.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/83255190483.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/95586838779.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/kenem.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1bfdf61b34c5ec16752f597ab4e9b49c/duxibuxakeliba.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/91000143935.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/go7pp31iq89p7dujmu9q2qbtco/gajajonesiwomelugix.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/pobusugupumipasimate.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/17347761604.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160943c9fbbd85---52927099914.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/batuvakamodosavifedo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f924669b79---69511179700.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0899b3420bb0fa52288650be5a588284/36216298137.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/lutosagadixewibiwafaduf.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/15879869765.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/027f966a44df91402bd24a85d58f37ea/niwedoj.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/15205642140.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/fibix.pdfIn PDF document text
    • https://designclarf.it/file/49928329016.pdfIn PDF document text
    • http://rayanchem.com/d/files/zegedilewaxunuzuves.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1eb320a0e116a2bfce1237d7ae728cba/bovodezubesukezivakab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=genetic+engineering+articles+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_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 10716 bytes
SHA-256: 23aef0e5e6cf4078d61aa2f442fed76defbf1d3df1c4ba556ec11602276c0daf
font_02_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 19004 bytes
SHA-256: 539f95dc8c35b1c4f41cc7ce18b15b33df43f770a1af3ceabae6f69fd5a6bc70

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