Malicious PDF — malware analysis report

Static analysis result for SHA-256 eede2bd8c3f6e2cb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 16:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6f24c92eb2d66e1dc938731d086d105 SHA-1: ee067eebf67dddb4ef652b6527cf8f64bd4ea0fc SHA-256: eede2bd8c3f6e2cb637a1e1b0a1e8be0857772495caee5091d68119cb15cd097
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, many hosted on what appear to be compromised or disposable domains, strongly indicates a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF. The embedded JavaScript likely serves to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medvor.ru/uplcv?utm_term=adblock+for+android+tv PDF link annotation
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138324c90c0a---medipiv.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/taledulotoreda.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lewujebugonojivilokug.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109051512081895.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/kakarisivotopuganuvuge.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/nesodonupireberuxibori.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/jupubujafomefarupodabowo.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/nelerakipev.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/86474592706.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87279256634.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5eca0bfb742dbf4d39ef7e7a3c29b9dd/99360010996.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/xenipuvudikenaxuna.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/83760438383.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/46905807320.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/5408214309.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/47603137762.pdfIn PDF document text
    • http://guchen.ru/d/files/xibekaxanonafogibuma.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/14834427a380b88d3f4330fa7d540c47/15532907049.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/fomujomek.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/30826135218.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/3280769955.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/lapolugimoboboxulo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/66680733044.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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 18620 bytes
SHA-256: 5c361aae7f00272c8634c92c75e6ad3db32cebbff66df1dc33e1c7daa5d38833
font_01_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10448 bytes
SHA-256: 872db89219bd4780398a97e868caad941963d82fefb00a47376bb91188c324a9

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