Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7224d656f9eecc2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 12:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66fb4d4ea0848577382f14c1e1dbf1c0 SHA-1: 070ad4d240ce754349a807ef8e6e4a7f10eae4a5 SHA-256: a7224d656f9eecc20fe2a542d3f764b47de2963258d610253b8c556f869b752c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also includes numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amandatour.ru/js/ckfinder/userfiles/files/leninileximanufavumuzeke.pdf In PDF document text
    • http://zespolbahamas.pl/zdjecia/file/44781215076.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/dadunupikubi.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/68290162196.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459eac887---polipafedusozumujibo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/doxili.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/gepusiveviwogo.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/bavijagojupovivavizo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb0d58e61---68327183525.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/gemixojipiwekuxidamojun.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/82730061844.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/23750877858.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/xesorekalufagop.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902131949_1133106877.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/7882696951.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35200933002.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/19310219265.pdfIn PDF document text
    • http://logicamail.it/draft/media/bimudowusavegedupozeni.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/35582269268.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/48437109223.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6cc05064---23283633306.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318b8382a59---xutinoxovagalono.pdfIn PDF document text
    • http://bakoca.hu/files/file/rexirotamizerejanaliziru.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090701532773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=spider+man+2+java+apkPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 10604 bytes
SHA-256: 02d342cf5ad59cf87688c6dcc4d760bb27c8dbe415b9b16e66db4775d5e76afa
font_02_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 19524 bytes
SHA-256: cfa092787b5baa6cae6db68d09231a42f854e29e1e6aca787baf63c16207c21d

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