Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d3835eea853429…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 18:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b300459441e566ae4f15d4a84d1af0d SHA-1: 606cbf379aab36a2c153a9093a1ad88156e0a63c SHA-256: 17d3835eea8534295e06b170bd18eeea5acd5f6285dbda3ba4beb91080124256
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised WordPress upload directories, suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc8f0e40f2---45030305116.pdf
    • https://niboparis.com/upload/fckeditor/files/mejuvexutofog.pdf
    • http://netshopnepal.com/userfiles/file/58825706468.pdf
    • https://walkandsmile.com/userfiles/file/57930804985.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f25d186481---11936615405.pdf
    • http://kirilmazbardak.com/userfiles/file/nemeruguvinevif.pdf
    • http://zaun-produzent.de/userfiles/file/89317796960.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/be92c66350293a7800843c6224f20264/pugimexefuvilopet.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c10c72d40---11075518197.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/lolixikudejexilimomipugi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd0c1a361c---lagurutojukatesevo.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/25339919068.pdf
    • http://m-styleauto.com/js/upload/files/zubuf.pdf
    • http://transportdiverse.com/uploads/files/kigej.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b1binfjqvm3fr5e828f1irb2k7/zobureg.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498e8d6562---rotiboxufoxusugamexidodar.pdf
    • https://ludifrance.fr/userfiles/file/86826572540.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6orgga87t0aqscs158tg45mci6/97143761535.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/19378786013.pdf
    • https://ltssinternational.com/res/wysiwyg/file/molixodaxabatuzox.pdf
    • https://larustt.com/upload/ckfinder/files/begiguwoludev.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/20239910517.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f34b778f6---rawenimepukogiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=asteroid+passing+earth+tonight
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c0.bin
b53530b63e4f50275aca21cac0fe775ba70f89009f62bca23288e3b8a0f1305e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 18576 bytes
font_01_sfnt_off000119da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 16792 bytes
font_02_sfnt_off000131f1.bin
b468471b302475ea424dee458f39ab010f7853b34a66393447ca989410b680ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 10604 bytes