Malicious PDF — malware analysis report

Static analysis result for SHA-256 c434ee1d732779ae…

MALICIOUS

PDF

94.8 KB Created: 2021-08-17 20:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afc5cc76edbe2244c619ca58b212a18d SHA-1: 683b0752eac1ec2e03c5e5620f8cdfa30bc7bc1d SHA-256: c434ee1d732779aecf20c635a443d79313d7f5892802654aa5d234b122f5bd65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be part of a link farm. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://morethancars.nl/uploads/edytor/file/2885346804.pdf In PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/47626778220.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/duxodarujopodu.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/24695383721.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/11fac2f93c8f963ca98dfd40fc12c903/26843789623.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tebevakosaf.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xoguziwike.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/c04n17b9uv9t96vjchs9oihb61/19067797876.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/bekovifodir.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f16b0eefc6---mepozalazixemesuw.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbc3af7c7---38449232390.pdfIn PDF document text
    • http://kodemari.info/data/files/wepaxaledokukadolulivu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ac7d67a154---69667409857.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2163f5a5afcf06a6a3d6e09660d46593/92827727373.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/xikibenilekuguturelu.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lapojubugoxamufevev.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/dsj5ggs78u1opue49ml8viv99k/nunelatu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/rujezoxikunubogeloke.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wuweruminilupuwuzumoweku.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/62a7fc38ee37c1a601c0129cc1db977f/28864433896.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d230806c2---wesoguzifaze.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7a7e6143---rodipumafinemonanus.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gubaxunupuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=new+movies+tamilrockersPDF 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_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 10508 bytes
SHA-256: 11f4f83a8aa4eddd0e705d5d98fb92a20f131725a8095c047307d60ad8c211c4
font_01_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16560 bytes
SHA-256: b10f613d6b146dd1515c097a8f565ac723a39548346640cf52d0121850e1826a
font_02_sfnt_off000152e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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