Malicious PDF — malware analysis report

Static analysis result for SHA-256 4485ece21ea1946d…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 09:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72893d60c2e136de8ab0313b7fc32c5f SHA-1: d14b679546c0a6be87a841d9983363ea02c80bbd SHA-256: 4485ece21ea1946d44922e885cbb73fe672fadc9ef9531f9be6072b5e28eec16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates links to compromised WordPress uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=dtw+to+sdf PDF link annotation
    • http://edu-soft.ru/site/htmlimages/file/38619589093.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/goxovaduxobaxibu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pofalikazogadifujokopug.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/pejenedujotal.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/lufilabodalajemozusupen.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/67795106529.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/728ad20123de023e69ea8da4eb456a90/91793025631.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/dexufirenejogawajet.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gesuredewupapaxapaparok.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/51337814559.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bebijonemagawalisuvi.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/difikixi.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/80507791997.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/vanujinimodomofaso.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3f84ff4c539631ec56af88d44cda905c/27102963902.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915222123.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/vuwazedo.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nixotuvexebukedokazuvebok.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/86413204095.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/34480718773.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158aca0d34dd---30331797123.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/sedojupubilenanadutadadop.pdfIn PDF document text
    • http://kes.org/upload/editor/files/13414568209.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/28675372301.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tapeganol.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pibovenevepevugavogu.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/tojenogitebezazilolezuzux.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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 9796 bytes
SHA-256: 6db512317192d51637680065f6ece6a9971206fff377b97d046824e6478bf6d4
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 15176 bytes
SHA-256: 423ed9813e7f7761c230d11ba0e4eb9f3af85c56814503bb44dfc1db01a1ad9c

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