Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba300e5d3bc7d43…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5082d08322bf6aa04c723fd44331538 SHA-1: c56a9a3f77ce53d913ec93607afe248cb7700f29 SHA-256: fba300e5d3bc7d43d586924fd175e621bf360a4b3f91f6845261424b1c499783
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 websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=avengers+theme+apk+download PDF link annotation
    • http://phunphu.com/userfiles/file/viduxogewudadikodemekos.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/5288805316.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b176fa42bc---72057784907.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/wifewawolonowedirejeno.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/97601387309.pdfIn PDF document text
    • https://terracell.pt/images/file/30047611197.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fuwilatawatebuweretamu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/65a34dccc7dce9bb8b87366be944c192/leduriralatifa.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/92933267260.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/wukiwofowe.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/rogosibakuno.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tezenudivijifoku.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/28581528060.pdfIn PDF document text
    • http://lejonhund.com/upload/29068865326.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/towozegabasefivijewudadu.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/49105143734.pdfIn PDF document text
    • https://castel.ro/userfiles/file/15490594315.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/xomovapimonivipu.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/rejuguze.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wokaruvijamegojorabiv.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4q70eiqrnqsua4rei0194t3v7l/vojuv.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/20432276317.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kadubome.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/93623561518.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_off0000ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 10972 bytes
SHA-256: de2de78cd6cd4e48cf3671c42d34925bb703f626ea982675ecdb58fd28330347
font_01_sfnt_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 14376 bytes
SHA-256: 29420682976313b9812b8fde5b5c9fbf301de359538f23acbb83d37a6750685c
font_02_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1