Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92b2cde7a901b54…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49d749386042d784dd5ca9c13d80af4a SHA-1: b1847e913683ee3ac2f30769585b7fd0a27374bd SHA-256: a92b2cde7a901b54aac6b58e3fc759b4f998f9128f6e3bfba767c72f72be09a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.emailposte.com/pictures/99273873861.pdf In PDF document text
    • https://global-product.org/CKEdit/upload/files/32442763826.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9kud0c2gala8q3emil6vc2elgr/kabakusulixoxuzud.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a04bd4a4f6034c786a145641aa67d3bb/petubaxujuvorefezutitesid.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/benenadexotiwezaw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a3c7adf6---64024580037.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/20359946973.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724f5bf06b7---zenafirani.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dojuxutogivadegetirivo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/gefet.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cabc0aac1---winuxodozosavuruse.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/kibigusiti.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/780fff6cf440bd54f3dd33eb12130c27/6098991034.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/5519278195.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/62004844960.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bbe95863---pemip.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac5e8c16f---waliwa.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/18428166128.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/bojitipoxifo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b30a26124b6d7444f6b0aca0462cf6a4/jafolepurovebis.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/lufexezakilagoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=different+types+of+fastballsPDF 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 17472 bytes
SHA-256: 673736573e8d01e16131f975bdea240981c7d7a0e0097af1cf171d370c4ebd03
font_01_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 10608 bytes
SHA-256: e96bf451c5817d964cff1858c75c132215183d9662f9bf61e44b3dc92c1f3f7d

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