Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65db48023e17a54…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 14:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e339dec345859cb58250eee1f7d13af SHA-1: 30b75ddb8a7fa1c926f47fe84bbcbf9ec5d19018 SHA-256: a65db48023e17a54a0125effbdb78d6f0faa9c00f672b31986a4a857025eef17
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads. The ML classifier strongly indicates maliciousness. The primary purpose appears to be SEO manipulation or hosting malicious content via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d95ac7e8a32d73cde1c3149b8cdfbb49/20439466899.pdf In PDF document text
    • https://dnmpaint.com/sdcc/images/file/kimirujoboxuzu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/23746fa8ae348d8832d434802bbd336f/gibomigaraf.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/40132403465.pdfIn PDF document text
    • http://519pf.com/userfiles/files/mikepugumapat.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e801e9f7b9---20921504225.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e4ff183b---26906502133.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bae7db3ef---7613334090.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/10c599f36e2886c0ecf191d713f42c47/60312298568.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc0746ca2---vagelukefap.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gqd3ufnfarl4t47g45414ad24h/desimuxafa.pdfIn PDF document text
    • http://amdind.com/userfiles/file/51887142555.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0af78d7d9---jepati.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076960323fb8---derobesum.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q4tam9l9avp74n5h22is219bu5/28617588099.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9c114c3716c55bc963968a63008b5263/41110100447.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/imi3gj3tp1ad3q8u707g4bes01/18468835014.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/buvevilulelaradaderavif.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/18142434989.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xodizuzisinep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+much+does+a+great+dane+weigh+at+4+monthsPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/radav.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16952 bytes
SHA-256: 6d079658ba2888b8e20bb7456c7f68a1eb720d0df4ad7f024be9ef36c8b7d78e
font_01_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 11024 bytes
SHA-256: f0234e3aee2e68742252d374e2dd1e5f3e453ecd0501e1bb02841fb2a97f4546
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1