Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9e3defbbeece07…

MALICIOUS

PDF

85.9 KB Created: 2021-07-27 02:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 238b0a44f0a621c9e28d6f8dce680948 SHA-1: b8662bdb843d4c5b137ef9f5bed9b885cdefdbca SHA-256: 3f9e3defbbeece07fcfa7c26bbfa6c201a1ede009682de40a6432e7ad09cff60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff29b2db0---papuwenexezex.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7347e953a---zibolezumajemaz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1k614f9snnm0hj10smn82l9927/86095775659.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/tugeregebopamalup.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/riridovunalefadarabewun.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tv07c5b3emgdapk919kfre16j5/lirodafasifixozivumu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/360c81a6a9d83fdfc1d52e27cf28e0db/dawatakefu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fesakogepaximiwuw.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/90448553136.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/wivepapowejefidelukepep.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/gidedi.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/xokiwe.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/puj3jrp5jum8nig75b28jpv29s/kitexijepotijidujamozibij.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vezezubufodagexuxeluzoxu.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/ledipatotuzezalikuja.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8908e9d66117d9abfdaaa550f9b7abe8/fuvasejami.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/259d3a6408d74f1dac7c8caf267c8280/lilumafatowu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090b84d5655a---83105709004.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075815819f4c---paresiguni.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0a0b165b61739e420340859b21cf00cf/30285220944.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70109b8d7---59573165905.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/99984057709.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/lodubezuk.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/xosasan.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zuronojuxikesowik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+musica+youtube+celularPDF 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://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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10972 bytes
SHA-256: 3f689f08e45d7dcad223f74f36bfc040968081c5ae4234cfce0c572fbe3b4dcf
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 18340 bytes
SHA-256: 36df84cc0bf311923a23b58835899dcf42e9c9d0115cf2f5da0599563a4600e1