Malicious PDF — malware analysis report

Static analysis result for SHA-256 83adc77b03efc8f7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 06:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9cfe2d1875d9a9276d70248db3ba150a SHA-1: 98a98a55225f5c041d02bf2c62e2cf24b04205a1 SHA-256: 83adc77b03efc8f70df90639897ccadb7c61d3bfa11ca9deef56833dd1b7b523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=quick+switch+keyboard+android PDF link annotation
    • http://nuovojob.com/userfiles/files/subarikevebenev.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161388c6339ccc---zadave.pdfIn PDF document text
    • http://mq-water.net/upload/xujimowut.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/95806984071.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/83435879874.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/belasigagakemubogibax.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xuxaruvozukalapafegafu.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/pajotemafowobuwulugusuw.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a3049820---doxojuzo.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/10527188042.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/ninawobuvujixepepesojipu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1d8b2f24065cbc81dd08c8c185c1da30/tugeka.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/13360049651.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/75091574835.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919085940.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70012664683.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16146bab3aa8bb---gotodobusotox.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/514f45c92c15bfe61c62ad553a459c8c/19809532401.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/67378063328.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/28960615693.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/vezoguv.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/setalikutanoletumejupo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dizuvifix.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 11012 bytes
SHA-256: 01de5ea5aae671b03bcec20762f55bd5c6f58d85e6c74f0155231e9f11cceb91
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 17684 bytes
SHA-256: 81ac0a6b9e021d0e3b06618048b2efa8314862b9336cfe850da3de838cc0b20a

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