Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf9c2dbd17e4649…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 689997bff2c834f5c6d7edc4a55b1285 SHA-1: 543d663d220eef88e6187fda65cb623b6458c4b2 SHA-256: 6bf9c2dbd17e4649fb3ab8cbb4f137681ccd985fca630a9e50d6b683bd7de8c5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as a phishing or trojan distribution vehicle. The presence of multiple links, including those with UTM parameters, suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=acte+uniforme+droit+commercial+general+pdf PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d7133026---juworazojupoziwobilub.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/sagelimasos.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/61594999787.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ff2f2c04207568326d57de4788e1dfc8/45006967001.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/82066298990.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/revonakarudate.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/28396309960.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/83367295341.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3dc87415---sagiwutego.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/zedesidupuzutipaguri.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062422143028.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/11448354331.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ec9e451de0a4a3a153509b7a95d46d01/80626752603.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75bb638cc---31064300523.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/zufajiveputogivutu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d836a67b9d---matukataxuzaxalew.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ggosjmva5mebijjvn45saquc7u/wofuvokafemodirasu.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021072211545661.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/bababumede.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/fuxapizojaw.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210708080439.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160854eb6dc10c---rigokukozanoduvebibu.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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10876 bytes
SHA-256: b084c400502c2273244c45d8483af7b2d77441826f598e1fe8724570565a4104
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 19264 bytes
SHA-256: 281bc69681826cdb83a89d49328a0b8725ed85aa3be05596eb1e5a4c072e342e
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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