Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8715abf83955fd…

MALICIOUS

PDF

86.4 KB Created: 2021-08-17 07:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88218d4df069512e903144ea43c1dc20 SHA-1: 63714bd2534080226d434d4a47e9c70eec2fcdc0 SHA-256: 0f8715abf83955fdb2afaaae640c3edb586f6c2bc5abf6d678312cf788d09e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d970fc60---52569452705.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e74cdbb49d---fuwapurafitiwero.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q9nqm5v0eluajq7d5mbljhoc03/fanadivozodina.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/gifulifudubep.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d432588c39e---tapez.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f184c4a6a9---xigolebilanil.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ab9def3fc74befb24004b1cfb15b371c/vebexokunosuzuzuxofixaw.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/50856725746.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/tokozixomiwo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/16258069059.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210620211847.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zefifutijozuwakufomesu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d537abe54a5---jutidiwudujukez.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/90942955359.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0cf379d5---rumojarekimaxewawiduvawuv.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/179d28618d5a3439d9a9d13d1665670b/xososusadikobu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lajor.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/80106348713.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160923a363d9a1---xolosalovakupolo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/324109642a3cd02badd03b66bdf0b89c/59181239748.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31529e623---72985986161.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/16200388169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=integral+definida+area+entre+dos+curvas+ejercicios+resueltosPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 18496 bytes
SHA-256: 4f2551f1d67d1dfe46cc3f91f56e3016b93b666c905fcf1cd69761459d805c35
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10896 bytes
SHA-256: e570435a166f8df6726460e5167ec87bdef7ee81414f26faf8b3d717dedca328

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