Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a50ee80883be81f…

MALICIOUS

PDF

97.2 KB Created: 2021-08-14 18:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 46690d63a31e280d51363f824e58a148 SHA-1: bdddcc397702946d69a34a57ec15d40d77687357 SHA-256: 7a50ee80883be81fd43570cef6f2e20b326fcf91c15babe911f6c6e8cdd32b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting. These URLs likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=ejercicios+resueltos+de+operaciones+con+polinomios+4o+eso PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/612a0ac683e52e427426d05a359984d1/2469531668.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/m9pdko04fq686at93r70koa532/bedolijija.pdfIn PDF document text
    • https://btegypt.com/file/51297512819.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8164e24fa499924669ad7c845361fa2e/gukaboxiwivatuvetekad.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087646f21bfb---folitemagila.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/23166827895.pdfIn PDF document text
    • http://nessium.net/userfiles/file/48103260807.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/navana.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/33389072714.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/imcg3j992dcpqfec50boro3f9v/58470531172.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/38528020270.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/fifedekuxem.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e34b98ceb815b42fe77d0fbf786592c3/56025639374.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/21821627386.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1202c91529---pijeroxufutenobi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/nudefaren.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/21047823087.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ziwuzonaxolupamoke.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26e85aaf7---88418034915.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/6304962062.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d17f31a9d2eb27da245e5c48111e3b9e/61873758659.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/dogivokuxak.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/wixabi.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_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 18984 bytes
SHA-256: 326cf5e8b9fcb0b550ab0d305b9d353249eb46adc75e62ef870e70bae0f300a3
font_01_sfnt_off000141ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A03 10964 bytes
SHA-256: a04ace9de79fc74067b320e8eb441c3ee51d1ba45e9ec5d81cc946130682feed

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