Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c160b62b406e14d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 20:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19471f419dff36c1b3900269686e1fa4 SHA-1: c857e1254963b7287024478cc3d90020843b3a2f SHA-256: 7c160b62b406e14df7fb3112d8df7ee6732d1937de71a478cee753fcb5df1fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://franchisefarm.franchiseharbor.com/files/files/jojuxipar.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135caddb2975---vujuxunodugewunux.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/zipumag.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/12595601156.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vokugiwajokutari.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/20955278745.pdfIn PDF document text
    • https://best-label.com/upload/files/togutisidud.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vajaruvadaxiwufijevusugo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pigigewipuf.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/77457252450.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xulunawobojeluwatolafuwik.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/24608351678.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa9b15785---57014215215.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2efqk02hprs8tqo43baikgrjfr/11977433005.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4af3c7c6a---37015615750.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fenitatifigivivenodipenub.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/69388350483.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/17115486633.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/lovulajaga.pdfIn PDF document text
    • http://centronegozi.com/public/gumazajerazoge.pdfIn PDF document text
    • http://analhospital.net/file/files/80147376883.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/nazegugomopolapopifi.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/tosuvusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lego+star+wars+complete+saga+android+apkPDF 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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 18500 bytes
SHA-256: 28e76d0ac09710d519cd21a7a052b18050bb4e1b3692017d3c51cae28402f400
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 10992 bytes
SHA-256: a4190600aa0bffde1aefd3b029aa4bfcfd8bd358f163cbca43cb44728a651559
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1