Malicious PDF — malware analysis report

Static analysis result for SHA-256 35046a1235f7a080…

MALICIOUS

PDF

88.1 KB Created: 2021-07-24 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1872c0f940ec411cb7ba15b3ed557ae8 SHA-1: f46984cdd147ebd472c8b011c5ac28de9aa34180 SHA-256: 35046a1235f7a0807362504de9823a3337c3933313a9a10d324898def005c1f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as phishing-related. It contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or to facilitate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://daisin1977.com/js/upload/files/84883871826.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0duf5j6d7lcluqvoh0jm6bqsu5/rewita.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sujepanixudawogogodizi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160850b5f4671d---10793788096.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/degedugolafuko.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/sijudewadugerikov.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/mugibogakojilufiso.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462db7b36c---17742815629.pdfIn PDF document text
    • http://ipublicity.cz/data/file/42420158302.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sa5s6cl5qm9si1c4a68cvh9sd2/dirimop.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4e8cc9b82f3fae50be583c8a5e545ec1/17509575373.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/gegukaderibode.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5cc9a67f---13153347622.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/20b84ffb169ea9eba7e064959f1632b8/96551754087.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/924f29a8d532791968a3152cc8b6c608/99009292019.pdfIn PDF document text
    • http://www.polni.si/Images/files/fuzawuwose.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7dee9ec97323db64cf55edde0fd23480/femawofuvu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/b7ss474slbru0bvci13agqdlkb/jejesekefigilemapibetuki.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kibasarulenasutuvebevume.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/832e433df3ac744b81b1755aabdc0a4a/fokevopugunu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/18097016a8f079314b5c2c9709185f96/nugimujot.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/wagufuzefuxuxoxumabik.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/886f36b430e24fdacfa3dafc53e3516c/87442014082.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6a98ecced7f70bab0db65ffff8c5c27b/25505627807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=como+se+dice+gracias+en+mixtecoPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10800 bytes
SHA-256: c19d2cd2ac58f9fec7f7531fef1dbbcd16d064c4c9f70cdfd6388e25d73f7347
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 18892 bytes
SHA-256: ee84dfc2c0f61ef211175a519b0abf5b1d8e3624dc924e67558477ce54b66bd2
font_02_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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